I think Tav is definitely too bland and remote from the main story. What I think could have worked is to make Tav Durge lite where you get similar options and prompts but it always remains your choice without saving throws on whether to act on them or not.
Otherwise main issue with Durge I have is that the switch between the Durge specific dialogue and 'standard' dialogue can feel extremely jarring. Like Dragonborn Durge still having the standard Dragonborn dialogue options when talking to Shadowheart during the camp scene for example. It just feels random at which point the game remembers that you have those disturbing urges and thoughts and when not.
