I also hate how each companion needs to sell seperately, and how every companion has prices adjusted to their charisma (Even when talking/initiating trade with your high Charisma person). It either means your Face of the party does not matter when selling stuff, or you need to do the extremele tedious chore that is inventory management (It is a chore in BG3 and DOS games. Moreso in BG3 though) and move all the lootstuff one by one to your party Face.
It is not fun, just busywork and feels like a chore.
Can't really share the worries about "balancing purchases" being time consuming (there's literally a button that does just this in an instant) but I couldn't agree more about the quoted part.
It's really nothing else than tedious busywork just for the sake of it.