In general, I can say the following about Astarion.
I am incredibly offended by the details of his past. He didn’t tell us anything, initially, I thought that besides Kasador, something would pop up in Baldur’s Gate, but no. And it’s strange, even though he says he doesn’t remember anything.
The way Gur simply forgave him is very superficial.
His and Cazador's interactions are so short. I don't believe that they have nothing to say to each other. Everything is too simple and seems unfinished.
And also, Astarion lived in BG, where his home is, his parents, he is only 300 years old. His past as a corrupt judge. I think we should know this if we return to where most of our companions live
Why in the end no one came to his grave, it was abandoned, and if there is a reason, I would like to know this reason.
I also agree with the hot scene, this is a very sore subject in his novel, you have to understand that everything is getting better, otherwise I have the feeling that he is forcing himself as before.