I think that's exactly what they should have done. Leave the companions as strictly companions and focus on these different origins as backgrounds specifically for the main custom character. I think the Dark Urge as a gameplay concept is brilliant and if they had done like, 6 of those I'd think that's really cool.
Great take, strongly agree
Also completely agree with this.
I am wondering if they made Dark Urge as a way to test this. Will be interesting to see if this is the direction they go with DOS3, BG4 or whatever else is next.
Going by their history they clearly love and take great care in writing (and designing) memorable characters. Yes 'DU' is def them testing the waters, but unless the userbase calls for it it's extremely unlikely they would steer in that direction.