I don't know. I guess a larger hotbar would make it better. Perhaps it is simply that the hotbar is too small. I mean, I know there's a setting now to turn off Auto-place things in hotbar, so if you don't want things just randomly popping into it you can turn off that setting and just manually put everything on your hotbar.
I think, for me, the issue is that I like when games auto-organize things for me. I liked in Neverwinter Nights 2 I could hit a key and open my spellbook and there was Level 1 spells all in a row. Level 2 spells all in a row. Level 3 spells all in a row, etc. There wasn't a lot of hodgepodge going on like this hotbar in BG3. That's part of why I like Solasta's. If I want Special Abilities, I click on powers and it pops up my special abilities. If I want spells, click Spells and they're all there. All organized for me. The only thing they could have done to make it easier would be hotkeys for each category instead of so much clicking.
But I guess that's just my own personal preference. I hate the hotbar only because it's everywhere. Potions next to spells next to Astarion's bite ability next to Sneak Attack Ranged next to Spell Scroll next to Throw Brine Shell, etc. You pick up new things or change your prepared spells and then you've got to manage the hotbar all over again. It's annoying to me, just like item management.