All the authors of the autofill complaint threads are low elo scrubs
I'm pretty bad myself so my standpoint doesn't mean much here.
With all due respect though, the autofill whining comes straight from bronze/silver/gold elo players. There's a reason you don't see Plat/Diamond people complaining - they've always had autofill in peak times, and dare I say higher elo players are a tiny bit more understanding that you have to know how to play all roles.
I don't mean to discredit their opinion basing on their lower ELO. Their game experience is just as important. I'd just like to note that currently they're the only group complaining, albeit quite a large one, and higher elo players for some reason seem to be quite accepting of this change.
Autofill isn't a good thing. It reinforces the idea that Support is a shameful, unwanted, "somebody has to do it" role that people have to be forced into. But it's a necessary evil. Not just for queue times, but also so that people who queue as Mid/Support don't have to play support 70-80% of the time. Not that you'd know, since y'all whiners only want to solocarry and never queue as support secondary, but it just happens that lately queueing as Support Secondary became much, much better. Go test that shiny Lux skin as mid/support and check it out (just don't go full ap without sightstone when you get Lux support, also check out these dank shielding items, Grail and Censer). Which might convince more people to queue that back, since many resigned when they saw they're getting support too often.
Sure, there's a problem with support role feeling unrewarding, mostly with how you feel obligated to give up all kills to your ADC and how incapable of 1v1 against basically anyone else you are in the game. But for now, we need autofill, and you're all going to have to accept it.