I don't really care about the extra dialogue if Larian's willing to do it, but those of you that want to skip the requirements for continuing the Ascended Astarion romance (being a spawn) are hilarious.
There's already ways to skip breaking up with AA by skipping long resting until the Netherbrain is dead. It might be hilarious to you but it's obvious someone at Larian supports it if they let AA go to Avernus with Karlach or let Tav/Durge put off becoming a spawn even in the epilogue, without AA breaking up with them.
Tell me how it makes sense this loophole exists? Why don't they just make AA break up with Karlach and an unturned Tav/Durge with no option to delay it in the epilogue?