New rules and Items

I like the weapon's history but what would be good was if you could create your own custom items and personalise them that way. Different combinations of raw 'ingredients' could produce a new item eg a salamander and a magical +1 sword could be combined to make a flame sword. Bind a demon, very risky, into an item to make powerful weapons etc.

I agree with Memnoch that the NPCs behaviour is very artificial. Even the characters who can join your party will hang around for months in the most dismal locations anxiously waiting for your return! When you go back they are still gracious and never once ask why you dumped them in the middle of a dungeon full of evil monsters in only their underwear.

I would like to see more plane travelling in BG3 and a far less linear plot. The god's should also take an interest in the child of Bhaal. Imagine Cyric being on your tail! Quests could revolve around appeasing the gods to aid in your defence against him.