Actually, even with multiplayer angle, I'm not sure why it'd be unreasonable for 6 players to be allowed? Would it require that much resources to update the menus and code to allow for players 5 and 6…?
No. No extra code at all. I had 6 party members in Prologue with 4 custom and Lae'zel and Shadow with a scrollbar for inventory. It's already there. They just don't allow it after prologue