I was wondering how the epilogue accounted for that outcome. It's a shame to hear it's undercooked. If Tav asked to be a vampire then it's right that in the epilogue they already are a spawn, considering Astarion wants to turn them the first night after the final conversation. If they went with Tav being talked into it before the party, I think there would be complaints that there was no player choice involved. They could perhaps have another discussion about it during the party, with Astarion being impatient about the whole thing already and putting some pressure on Tav? We'll just have to wait and see.