Absolutely agree, I can pass the bad endings I got for all my other characters, 'cause I made a lot of evil choices along the way so they felt like a direct response to all the bad I'd done. But Astarion I actually had make all the right choices, he has so much good boi development only to be treated as the butt of a joke in the final cutscene. He did everything right, he saved the other thralls, didn't do the ritual, and genuinely grew a lot as a person. His ending was not justified at all and I really hope in the future we can at least have an epilogue where we can wander around and see the state of the world and maybe find him, really his ending felt like that's exactly what we were supposed to have
