while this is true it's more an overbearing amount of midlaners/toplaners.
I remember a post from someone who did autofill only and it was mostly Supp and ADC, a bit of jungle and rarely Top/mid.
The problem probably isn't the support role or the support champions but the fact that you are sharing a lane with someone.
Up next is jungle who while isolated in the jungle has to gank and interact with/ rely on people.
this is imo understandable. If i lose top i know I lost it myself, mid the same.
if as a jungler every lane is losing it becomes hard to stay motivated.
Botlane is the worst in this case. As an adc/support it's very much possible your "partner" fucks up multiple times.
I mostly take 1 role i wish to play and then fill. when i take bot + fill or even bot + supp i often get bot. and if i don't mostly jungle or support i had one rare game of mid a few days ago though.
Autofill isn't perfect, but it certainly isn't as bad as people make it out to be. it's just easier to blame something else, everyone does it, there's nothing wrong with that.