Patch 8 is supposed to be the last "major" patch, but I'd like to see some small changes that can add to the longevity of the game and add a lot to the gameplay. First of all, I'd like to see the remaining bugs fixed. During my current playthough in Patch 8, it seems like I've experienced more bugs and crashes that any other version of the game. For example, some mines blew up in the underdark next to a rope ladder than you can climb. The ladder was destroyed and I tried to jump to the zhentarim storage area. My WHOLE party was stuck in place when I tried to jump up there.
I'd like to see 'lone wolf' from DOS 2 be added to BG3. It would make playing with only one or two characters viable for the average player. It should be more balanced, because lone wolf with two characters in DOS 2 is very OP and make even honor mode trivial. A playthrough with only one or two characters can be refreshing.
I'd also like to see the gold in chests and quest rewards SIGNIFICANTLY increased. If you loot every single chest, do all the missions that reward gold and have very high charisma, you should be able to buy most of the weapons, armor and equipment you need. Instead, you can buy barely anything with all that gold. The game basically WANTS you to steal.