I guess Solasta has 4 because DoS2 had 4 too?
No, it's because 4 is D&D adventures recommended party size.
Solasta has 4 generated characters but let you hire two additional temporary NPCs when the chance comes.
In the same way TOEE has 5 generated characters but let you group up to three more (charisma permitting).
Anyway I will never grow tired to stress that “pen & paper suggests four” is a stupid, irrelevant argument that misses the differences entirely.
