Auto-filled Players playing roles they're bad at isn't a new problem.

Remember the times before Prefered Roles, when Positions were determined by whoever called out their lane spot first in pre-game chat? Where if your client was just a tad slow, you were always stuck with the last role unclaimed? Auto-filled players are exactly the same thing as the poor sap stuck with their worst role.

Now, granted, back then it was a bit more likely to learn all the roles and lanes because of this, but not everyone is going to. Just the same as today as it was in the past, plenty of people don't like Jungle or Support, and don't bother to learn it. Even those who do learn it still may not be the best at it compared to their main role.

So auto-filled players have always existed in some shape or form. People who refuse to learn every role, or have but are simply better at some than others, have simply transferred from being the poor saps to choose/call last in Champion Select, to the occasional random sap who gets a different role maybe once every 10-15 games. In exchange, people get their prefered roles far more often. The biggest problem with auto-fill, from my opinion, is that people who get a role they're not best at just simply accept it.

They don't talk into chat saying they've been autofilled and would be better in a different position, which i think was something that was far more common back before prefered roles. I've seen plenty of folk, myself included, who are more than willing to swap lanes or roles, yet some autofilled just go silently into the game. If you're not playing your best role, just ask! Coordination with teammates will help everyone to have a better game.