i agree 4 man is to small ! Currently companions dont really give a shit about each another and mostly dont care about protagonist either, so adding 2 more guys wouldnt matter.
Experience should be divided between each member to balance out the difficulty, more people, slower level up, fewer people faster level up..... its obvious.
Do you know what some answer to that ?
-> that mean I won't be able to reach the maximum level if I'm playing with the maximum companion numbers ?
-> that mean that companions that stay at camp won't have any XP... They'll be weak when I'll choose to swap my companions...
You find it ridiculous ? So am I...