Division Hoppers? +Next ranked season questions

What's with players in higher elo games playing worse than the division they're ranked in? I just had an adc that didn't understand that shoving a lane would result in shaco camps and it was my fault that she died because i couldn't peel a vayne, blitz, and shaco off her, even though i die so she can live (because at the end of they day, she's my adc and i need an adc to win lol) It's not mechanic skills im complaining about, it's a complaint about players not knowing / learning the processes that each division teaches you.

Somewhere along the line in our league history we learned simple stuff like counter-building, synergy, strengths and weaknesses etc, and with each division we learn knew things to climb onto the next tier, and so on and so forth. That is what made me platinum recently. But then the lessons like "Don't shove lane because you're more prone to ganks" or "All players should ward because the support cannot cover the entire map with 3 wards and 1 pink" seem to not apply to a lot of players today.

I've seen Silver players ward more than any other division in the game, Gold players try to make more risky plays, which has its ups and downs so i cant complain, that balanced out, and platinum players feel like they're not obligated to do anything because they can solo carry. Looking at all the players in platinum right now lol. I'm sorry but the large majority of you guys need to focus more as a team than solo because while you're taking one tower, by the time you're done with that tower the enemy took baron, 2 turrets and possibly the inhib lmao. I haven't played with a lot of diamond or above players yet so I can't rip y'all... Lucky lol

There's more issues to point out, I'm just curious as to why it's so easier for players with lower skill to climb so high? Is there any changes coming to the next ranked season that would restrict how easy it is for players to become promoted to the next tier / division? Can Riot make some changes on league to encourage players to play smarter or something? Huge question for supports, if our adc is bad, and for some godforsaken reason we have to sacrifice ourselves for the greater good of the team (Living Adc > Living Support), can we get small, and i mean smalll buffs to support champions in future patches so we don't fall tooooo far behind? Increased HP regen for survivability or something? This only applies to champions that actually have support as a role. We also don't want a buffed zyra support or something like that lol