Originally Posted by marajango
I believe the reason for them sticking to 4 characters is that their engine probably can't handle more than 4 players at once in co-op.
The good news then is that it wouldn't need to.
It's not like expanding the party size limit would make mandatory to give each character to a different player... Or to fill the party in the first place.

Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN