My point is that all the guides to climbing say "If you build these meta builds, you are guaranteed 4th place or above". EVERYONE in plat+ builds meta in ranked. Out of all the players I've faced, and this is low plat, not even high plat, I've seen maybe 1 non-meta build in 4 or 5 games, so that's like 1 player out of 40 players who build non-meta. (and usually that player wins because he actually knows what hes doing and is probably actually adapting to other players builds to counter them). Nobody in plat is going to build
and just call it a day.
I've literally seen guide after guide say "this brawlers + assassins + void build is a safe 4th place if you use it" or "this Draven + Knights comp is a sure 4th place" but what if everyone else is building brawler void assassin or Draven knights? Somebody's gotta be in the bottom 4.
I'm starting to get sick of the gimmicky guides that tell everyone "Build meta and you'll get 4th or above" when everyone after a certain level is building meta. Maybe these guides work in silver where only half of the players build meta while the other half are experimenting with off builds, but from what I see Gold+ don't experiment in ranked.
Also the OP assumed that every player was equally skilled if their MMR put them in the same game and I was just going by that
if that was true then everyone in an equally skilled game would have to be at least 4th or 5th without RNG influence.
"Follow this build and start to climb" may be a feasible thing to say to people who are playing against those who don't know the meta and is still learning about how synergies work, but it doesn't help people who are already playing meta but don't know how to transition, when to pivot, how to work with the items they have, etc who are already placed in the league they deserve but want to get better.
And there really aren't a lot of guides on those things because a lot of it is intuitive and/or it's just not a flashy thing to make a guide on.