Playing as a tank, support, or noncarry midlaner feels miserable
If I play anything other than a carry role it feels like I have no influence on my games and may as well be flipping a coin to get teammates in those carry roles capable of performing.
If I play as a tank in top lane I'll just get poked to death by the obnoxious ranged tops, outtanked by juggernauts, and comboed to death by carries under my tower due to damage rune trees giving about 100 - 180 gold extra worth of stats over resolve.
Playing a tank I'd expect to lose lane like this, but then be able to have an influence later in team fights, but that requires having an adc that won their lane and a midlaner that won theirs to followup.
cc'ing a zed to take off a quarter of his health doesn't really mean much when he just zips away afterward with impunity while the enemy adc shreds my full tank build in the span of three seconds before oneshotting the rest of my team.
Same for playing any non-harass support or utility midlaner; being "carryable" and relying on my team feels like I have better odds winning a blind round of black jack than winning the game.