I hadn't thought about enthrallment. That is an interesting take on it and very possible. The lore around mindflayers, some of which is not included in the game, shows that the Emperor is a rare case of someone who retained their personality. But Tav's emotions will be severely compromised and they may yet turn evil.
In the end, my redemption Dark Urge felt so responsible for
being the origin of the entire plot
she took one for the team. It felt appropriate, but certainly not "happy." And I am okay with that. Even if playing through all the options after had me going through a lot of tissues. Or perhaps especially because.