I have no idea how much work it would take to add in different facial expressions and then trigger them based on internal flags that tracked your Tav’s dialogue choices. Probably too much.
The Ascendant romance feels like the most complicated one to me, and it seems like even the people who worked on it have very different ideas about what the relationship is/should be. That being said, I am happy we got anything like it at all. It’s just so fascinating to me.
However, when all is said and done, I feel that once Tav agrees to kneel they know what they are getting into. It’s on the table, and the choice can be freely made (there is no coercion). So if Tav doesn’t walk, I would prefer if the game assumed they were happy unless they directly choose a breakup option.