Fun side note: the main reason they went for five characters rather than six was because REAL-TIME COMBAT made it messy.
I think that makes sense for the POE 2 combat system too, because every class (even basic fighters) have an abundance of active abilities to use (compared to their D&D counterparts) and requires quite a bit of micro-management.
They did implement a pretty decent AI to help, but not everyone's into setting all that up.
