I've never experienced queue times longer than a few minutes, even late at night with my usual top/mid pick. So risking autofill so that I have short queue times is a load of bullocks. Maybe plat or higher it becomes a problem, certainly diamond and up it is, but why not just enable it for tiers where the queue times actually are absurd? Or give people an option to? ... Isn't that what the "Fill" button is for anyways? I can't be the only one who just does something in another window instead of staring at a timer count up.
Frankly, if I'm in ranked at 90lp and it autofilled me to support (or god forbid ADC), I'd probably dodge. I'm effectively being forced to play a role that I know I'm not proficient at, against match ups that I don't know, and now my team has to deal with a sub-par support/ADC. And no, I haven't forgotten the dreaded Pick Order, at least there you could let people know you're not good at a role and somebody would take it for you. Only had to bot lane once in a blue moon back then. Now if the game tells you you're playing support, you're playing support, everyone else got the role they wanted so whatever.
But hey, at least TT finally has a ranked queue without a full premade requirement, so I can wait it out until Riot hopefully removes autofill.