I'd be ALL for extending the default party size (or at least offer it as a proper option) because having to edit save files to make this work is a pain in the ass and it just got worse with the last patch where the "hack" stopped working for some unholy reason.

Honesty a four men party in a big-ass RPG like this feels so lousy.
But we've been talking this stuff for ten months at this point and to my memory despise claiming originally that they weren't adamant about enforcing this decision and they were open to listed to the players, it doesn't really seem like Larian cares that much of the general feedback.