And there are also levels of intelligence based on your rank.
To put down a dummy simplified example that's not necessarily true but which illustrates the point:
bronze - win lane, win game; group 5 win fight, win game
silver - player x is really strong and can splitpush; we can win by that or by 5v5
gold - player x is really strong, we can let him splitpush so WE can get objectives 4v3 while he baits 2 people or by stalling 4 or 5 enemies while he/she gets objectives and possibly solo kills
plat - same as gold, but add in 1-3-1 and the ability to also play around those players just setting up minion wave pressure and collapsing via walking or tp flanks to get 5v4's and 5v3's with the enemy team deals with side lane pressure
Now, the extent to which players may understand such things or what aspects (there's much more than just 5v5 and splitpush to do in games) players understand may vary. But it should be safe to assume players will know more strategies and perform them better as you climb. So if there are players in silver (nearly gold) who don't understand a strat that literally everyone you run into in bronze 3 or higher knows... then those players are either boosted (playing on bought or stolen account) or they are INTENTIONALLY choosing NOT to play to what they KNOW to be the best win condition (or at least better than the one they have tried and failed at for 10+ min). Thus, it can be SAFELY stated that said players are either boosted or INTENTIONALLY sabotaging their team's efforts to win... both of which should result in fairly immediate punishment. Now granted, maybe it's a strat that they are unfamiliar with - cuz not everyone has the same knowledge or strenths going into a match or to the same DEGREE. While this is true and could THEORETICALLY be used to support your argument, there is also this going against it:
As you learn more and climb, you will learn new things faster. Simple strats and ideas will be easier to pick up on or even combine due to your increased knowledge base upon which you can draw and your better mechanics. Thus, a simple strat such as 4-1 splitpush even if NEVER BEFORE ENCOUNTERED would be fairly easy for a player to pick up on after reaching a certain elo. A 1-3-1 has more nuances and greater challenges, so that would typically (but not always) require a higher elo still. But if a player climbs high enough... they eventually will have to have some basic ability to play around said concept. I don't think we can find a player in challenger who isn't knowledgeable or willing to learn how to play around such a concept as 1-3-1 for instance. Now I use this as an example to support my earlier point. While you wouldn't be able to excuse your way out of being garbage at or refusing to play 1-3-1 in challenger if that's what the team wanted, you would be able to in silver or maybe even gold. Why? Because while it's a concept that does exist at said elo, it's relatively difficult for many players of that elo to grasp. So how does this support my earlier point? I'm glad you asked. As I mentioned earlier, there are some SIMPLE concepts that exist at each rank/elo. Strats that 99% of players have at least heard of and probably attempted to execute. Stuff that entirely fits within the range of skills, intelligence, macro ability, and mechanics a player HAS to have in order to have HONESTLY (not illegally/cheating) climbed to said elo. This sphere of strats grows bigger and more diverse as you climb - faster for some players, but there is a minimum threshold for each elo/rank. Players thus failing to meet said minimum threshold for their rank/elo are either: boosted illegally (against terms of service for Riot games) or INTENTIONALLY refusing to execute a "simple" (for their elo) strat which they ARE capable of doing... in favor of doing a strat THEY and everyone else knows to be vastly inferior and for which they've gathered ample evidence (10+ min of falling more and more behind or outright feeding) to PROVE is a bad strat. Thus, players refusing to even give an HONEST effort into trying something different (especially when their whole team wants to try it) would be INTENTIONALLY sabotaging their team's efforts to win the match - aka intentional feeding and/or griefing. This is considered a very serious offense at high elo - and challenger players and master tier players were thoroughly investigated for around a month or more at the end of a season to spot this type of "win trading". To ignore it in lower ranks purely because they aren't master or challenger tier and/or because you don't have to buy them a jacket for their rank is just poor standards by Riot games.
The rest of the players make up more than 90% of the player base. We are the ones who keep the company alive - through our buying rp for in game stuff, through playing the game to keep in popular, and through purchasing of esports tickets and providing the viewership of esports events online. To treat such players as though they do not matter and do not deserve an honest and fair match in what is supposed to be a competitive game mode is unacceptable of a company. Think about how much effort they CLAIMED to put into making clash have competitive integrity - that's exactly what SHOULD be done with RANKED. Ranked solo queue is basically clash w/o having a 5 man premade. Premade 5v5 ranked is basically what clash SHOULD be or vice versa... with clash maybe representing tournaments they can have for ranked 5's on a semi-regular basis. But with the complete lack of effort to make ranked play have competitive integrity... many people just laughed at Riot's whole article about how serious they were taking competitive integrity in clash. But if actual integrity and semi-balanced matchmaking can be achieved in clash...then why isn't this level of action being taken for RANKED. Why do you NEED to join 4 other strangers and/or friends in order to have a CHANCE at having an honestly balanced match? And if they aren't going to treat ranked seriously below master tier or so... then why the hell do we have ranked AND regular pvp? Just get rid of ranked and have regular pvp and clash - with an updated clash so that solo players and smaller groups can team up with other appropriately skilled groups to make 5 man rosters. Because otherwise it's redundant... you have regular pvp, you have regular pvp (also known as ranked) and then you have clash.
The fact that you have posts every year by actual plats and diamonds talking about some games in silver being unwinnable...
The fact that I can be a gold player and for 2 years in a row climb to mid silver, have my elo tank from 90% loss rate (despite winning or going even in lane in 85%+ of those matches and teamfight and splitpush better than any one other player in the game for either team; while being tilted from 90% loss rate) to drop from something like silver 3 99lp to silver 5 0lp...
The fact that hundreds of others post about similar challenges and frustrations on the boards... every season...
etc.
Points to the fact that this isn't a few people bullshitting or a minor problem only experienced by say... 0.5% of the player base. Some people get lucky and avoid most of this. Some people don't play enough games to run into it. Others still avoid ranked specifically to not have to deal with this. But others of us actually enjoy being challenged by opponents of similar skill level to us and learning better how to play new strats and perfect old strats either solo, duo, or with a full team. And when we are getting multiple games IN A ROW of complete trolls singlehandedly ruining matches and playing far below what we KNOW to be the SKILL FLOOR (minimum standard) for our elo - thanks to having CLIMBED to our current elo HONESTLY - we get fed up with it. When it happens on a weekly basis - if not daily - to an inexcusably stupid level of performance by one OR MORE team members, well then Riot is failing to make an honest effort to adequately balance ranked and to properly punish players who are clearly undeserving of playing in what is SUPPOSED to be a game mode with competitive integrity and people putting their honest best effort into winning. And you can take THAT to the bank and cash it. [vayne-pose]