as you stupidly watch him run away and the narrator says: "Astarion's days in the sun are behind him. The best you can hope is that he finds darkness, and the comfort it once gave him" Then your character smiles and the narrator continues: "Knowing him, he probably will. Comfort was always one of his specialities. Especially when it was his own." Like what? That was so random. I can't even recall a single moment in all three Acts where that was a thing more than a jokey remark from him?
That has to be the most tone deaf thing said about anyone in the entire game. Someone at Larian clearly doesn't like Astarion.
Someone really wants us to Ascend him.
That's just it. It really seems that way, you get a much more rewarding and complete ending with him ascended than with him as a spawn. After cemetery scene (which I absolutely adore) you barely get anything from him. Few lines of nonsensical conversation. He cannot even define who we're to him, no clear plans for future, everything is very uncertain for him/them as a couple. Really, he is like a scared puppy looking up to you. Sweet, but kind of pitiful...
It looks like they spend all the time and resources for his "bad" ending and just slapped together his "good" ending in the last minute. I certainly hope that they will give us a satisfying ending for a spawn Astarion.