Increasing support skill disparity
Anyone who claims that the support role is worthless and requires no skill is a fucking moron and a liar.
I have gotten to the point where I cannot trust the role to anyone, since anyone who takes the role will go 0/10 before we're even five minutes in, or throw the ultimate shit fit over having to be the water carrier for an entire team, and more than too many players are simply overwhelmed at the workload that the support has, to the point that recalling is the most absolutely divine of luxuries, because every last possible responsibility that isn't get all pentakills forever has being shirked by every other role.
And to top all that off, the supports are being increasingly relied upon to provide powerful buffs even to champions that don't really benefit from them, or expect one support to provide the buffs equal or greater than every other support combined. Combine with that the fact that this support dependency, coming from the same people who think supports are worthless, means everyone is getting increasingly complacent about the game, to the point where no one wants to do even the most basic things because they think they're destined for a clutch victory, and make increasingly bad decisions and catastrophic moves, to the point that by the time we're even at the ten minute mark, the entire enemy team has pushed all eleven turrets, three inhibitors, AND they have two dragon buffs and a Herald, and no one on our side has even built a single item yet.
The game has become artificially imbalanced by a playerbase that has overfocused on exclusively one singular element among the countless others.