There are a few notable inventory improvements, but the most important is that BG3 is much less gear/stat dependent than DOS2. You don't have to sweat trading stats for each slot and character building is simpler (no skillbook type of progression beyond wizard spell scrolls, and that's optional). You'll still get engaging, difficult, beatable combat. The inventory is kludgy and there are a lot of items but it's much less important to focus on than DOS.

No lone-wolf mode made me wonder if the game would be too fiddly for me, but there are other ways to streamline combat. Champion fighters, berserker barbarians, non-arcane trickster rogues are mechanically simple subclasses that are fun to play. 5e is forgiving for party composition in a way DOS2 isn't.

I suppose it depends how hard you hoard loot... It is quite bad and filters are slightly lacking if you really collect it to pawn to vendors.

I don't think you played it at all