Would you still have the same trouble in a casual run?
I still don't get it what's the big deal with the removal on the PC item storage. I know organization is a thing, but Organization > Convenience? I'd rather just have an easy access to every single in the game, but that's just me I guess.
Btw, it looks like the biggest reason why the option doesn't exist anymore is because of a glitch. So, calm down everyone. There's nothing saying this is a permanent thing. We might get it back, even though I still don't see a good enough reason for it.
The newest pokémon games doesn't have that option anymore, exactly because the bag has infinite space. The item storage thing became obsolete.
The only thing that I'd like, is if there was a way to re-organize the bag by "Item types" instead. I don't know if that's the name for it, exactly... but I'll look for the name tomorrow.