While I understand the sentiment, I have difficulty understanding how this could be implemented in a way that was compatible with every backstory that people can create for their Tav. I already have issues with the game giving me a Baldurian tag based on my race, and I think canonizing more encounters/traits for Tav would be even worse on that front.
Call me overly simplistic, but my understanding was that Tav was the option for players who wanted a completely open-ended PC, and Dark Urge was the option for players who wanted a PC who was still a custom character but was tied into the world and had an established questline.
...though I also think people are overestimating how developed the origin characters are as player characters, cough cough. I haven't had a chance to play everyone, but in all the origin runs I have done, it starts out very reactive in early Act 1, and then drops off significantly. I'll consider Gale an exception, but the rest aren't brimming with unique content.
