My two cents...this is a big deal and is super annoying to have to sell or move items one at a time sucks a ton; however, I think there are more important issues that need to be addressed while we are in early access than a QoL fix. Until Larian has time to work out most of the bugs...gonna be hard to get um all...QoL is more of a thing i wouldn't expect to see until we are out of early access stages of the game. This is me just saying don't hold your breath on this one to be the top priority for Larian but i do 100% agree with you the QoL fix would be super amazing to have.
Additionally there is a sort feature...its towards the top center, right of the screen while you are in your inventory(if this is what you mean)
The game was released over three years ago; why do you consider it early access? Do you think this is a BG3 thread?
I mean sorting within bags.