Autofill issues

Why is autofill a thing? almost everyone i know hates it aside from the support main, alot of people dodge autofills and it doesnt shorten queue length enough for it to be worth losing a game. the arguement that its to encoursge players to play a role they arent used to is bullshit because theres only ever one if any supports on free, the good supports cost so much ip as ip build up is so slow and to be honest some people just dont find the role of support fun. it was an experimental feature that turned on only when there were too few players on, but now it never seems to leave and to be honest it's nothing but annoying.