The 6 party members is a good idea that has been put forward many times before. It wouldn't even be difficult for Larian to implement, modders have done it to both the divinity games easily and messed up nothing in the game ( with the exception of difficulty lol). Your attitude ruins any hope of being taken seriously though. Your #6 seems to imply that you don't know the time this game is set in, even if Imoen hadn't died around 1482 DR, she wouldn't be able to live long enough to be in BG3
