yeah, what that guy below said. Draft mode is for getting what role you want, for sure. Its why you're not in blind. You do draft for a better quality of game, where you get roles you want. Autofill completely ruined draft by taking that away for the sake of speed, and at that point you might as well do blind.
And in ranked thats just completely wrong. I play mid lane mages. I get autofilled support, or ADC, or top, and I'm fucked. I can play those other roles on a regular, but if I've been playing more mid, I should be able to ensure I get mid for the game modes that matter, while also having one lane also so its not everyone queuing for one thing. Seriously, imagine a diana main getting autofilled support, or adc. Just because we own ashe and know how to play her somewhat doesn't meant thats okay for ranked, especially with how the ranked system is right now.
And in general, autofill makes draft more like blind, and i dont want that. I dont want to randomly be assigned a role. That's not fun. It takes away all choice at the game. If i knew for a fact I had to play support 1 time out of say, 10, I'd be fine with it. But randomly giving people support AND other roles isnt cool.