Overspecialization: Ignoring ALL game mechanics
Even the most basic gameplay mechanics are being ignored now. The absolutely most basic mechanics that you literally CANNOT PLAY THE GAME WITHOUT UNDERSTANDING are being completely ignored because the fucking Yasuo mid only or feed guy refuses to build anything that might interfere with his pentakills.
Literally everyone I meet treats supports, tanks, fighters, mages and assassins as the exact same menace; absolutely zero menace and just a free gold pinata.
No one builds armor penetration.
No one builds grevious wounds.
No one has crowd control.
No one has crowd damage.
No one has magic damage.
No one has range.
No one wards.
No one pushes.
No one defends.
No one goes for objectives.
Literally no one does anything or knows how to do anything except flap their mastery dicks at the enemy and obsess over team fights and pentakills, even when it's the absolute last thing they should be thinking about, and most players aren't even good at that. I don't fucking understand this. You outright ignore 99.9999% of the game in favor of one tactic that hasn't worked for you for the past four years, even though you've only been playing for three years. You continue to do the exact same fucking thing every goddamn game, even though it doesn't work, even though it never has worked, and you expect the outcomes to always be in your favor even when you make the most absolutely dumb fuck decisions possible, like building a Thornmail to deal with Annie, because your understanding of the game's mechanics is just THAT atrophied.
Riot shouldn't be listening to the community about ANYTHING.