To be fair, its not a deal-breaker for me if the answer remains a definite "no"......but it would be nice to have 6 people in the party later in the game, when the difficulty starts to ramp up. That said, I managed to get through Solasta with only 4 Party members.......
Definitely not a deal breaker, but it REALLY would hamper my enjoyment of the game significantly. It's a big thing to me. However, handling a larger cast of companions DOS2-style is very much a deal breaker for me. Especially with companions having set classes, and that way of handling companions going completely against how I play games.