Why was Berwyn removed to an extent instead of just being declared "Feature Complete"?

[_____]

i mean, he was a decent enough teammate and had significant enough content. A good amount of characters aren't going to get more content or significance than he had.

 

[Tarnakus]

Simple -> because as companion he was not "Feature Complete".
We still need 2 more levels for every companion (which means at least powers if not a set or two and i don't remember at what level he was retired), and then they (companions) are required to be put into main or side quest which was taxing on the team.

So to conclude -> to make him "Feature Complete" at that moment he needed to be cut as companion.