And you think they ever plan to "fix" auto fill why? As someone who played before role select was even an option this concept of the game quality being destroyed just because you didn't get your role says more about the community and flaws in the concept of being able to select your role every game.
Could always go back to whoever is in first pick gets to select their role first and go down the row in order. That's how it used to work, except this time just implement it client side so that one person gets to select at a time.
Otherwise auto fill will always be a thing, because players were never supposed to only play one role or one trick one champion to play the game. The fact that it has become so common is actually one of the reasons the game quality is falling apart. Used to be that teammates had some idea of how other lanes worked because you would have to play other lanes at least a couple times every month. So, you understood if your jungler wasn't level 6 yet because you knew the jungle path, or you would understand top lane dynamics and match ups better, or why the support does/doesn't want to go aggressive and where to ward. Being able to play every role makes for better players who have a stronger understanding of the game and what their teammates and enemies are supposed to be doing instead of putting everyone in their isolated bubble.