To be honest, this thread is a very light hearted one and it's more of chat than a discussion, that was created to be separate from the other heavier AA thread, and so far I've only seen conversations about AA in here. You might not receive as many replies here as you'd like because of it.

Personally, I don't have a preference when it comes to this scene in UA's case. I remember hearing that UA's dialogue was actually bugged and not even triggering in the first place.

I think your criticism is valid and it might be a good idea to bring it up as feedback for Larian directly. The topics you brought up were actually mentioned in this thread, which is all about Astarion romance and all iterations of it, as well as things for Larian to be aware of: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=919717&page=38

The new spawn dialogue was also briefly mentioned there previously and we shared links to mods we liked in relation to other aspects of the romance.

There is also another thread specifically about UA here: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=901455&page=24