Autofill really doesn't improve match quality in low elo, at all.
I was gonna post this on the reddit, but the reddit challenjours would probably just dismiss this and tell me to kill myself, however:
Autofill is shit.
A lot of people might disagree with me, however I find it to be shit, and useless.
And when I say autofill, i mean somebody who doesn't play support is forced to play support because that is basically all it is. No other roles get autofilled.
I really don't mind being autofilled as support once in awhile, since I can play it, however it feels like every other game the 'support' is saying "can someone swap with me pls i dont play support".
Most of the time, if the enemy team has a support main or someone barely competent at the role on their team, then my botlane just gets rolled, and the game is lost.
Autofill was introduced in attempt to shorten queue time and "increase match quality", my queue times are pretty much the same, but my matches are utter dogshit.
It really doesn't help that this is the meta where the winning botlane wins the game 70% of the time, so every time you get an autofill support there's an increased chance in losing.