Nah, they really watered down Ascended Astarion. Honestly, there should have been a scene, where he compels Tav not to go with Karlach to Avernus or with Lae'Zel. Instead, he is like: "You didn't leave me, I let you go". At this point, even though he still doesn't allow to break up with him, he looks like he really isn't even that much obsessed and he just doesn't care about Tav much (because, obviously, he is evil and very selfish, so he did let them go not because he really cares about helping Lae'Zel or Karlach, like Spawn does). He is making himself a whole army of other spawns, so like... whatever. His writing is all over the place in the end of the game. It's really-really noticeable that his writer left Larian.
I mean, Tav following Karlach or Lae'Zel and abandoning him for 6 months is exactly "allowing them to leave him".
It looks really weird and out of character for AA. But oh, well. It's too late, I guess.
It's fun to watch your headcanons come into conflict with the game.
In fact, this dialog appeared in the game before patch 7 and was already in the game files,
it was even posted on youtube. Perhaps at the same time as the spawn had a new reaction to treason.
As for AA, since the epilogues were added, Tav-spawn could leave AA and she wasn't forcibly dragged to the palace when Tav and Astarion met at a party 6 months later. So I don't understand what OOC there is to talk about.
