Larian added a little scene to the end of the drow orgy of all things. They sure can add a short animation of the pc walking towards Astarion's general direction after Karlach is dealt with, for those who choose to do so. He's right there behind some crates.
And change what the narrator says if Astarion is the only person with us on the docks. Neither me nor any of my characters would ever think "the guy who's been abused for years will be fine by himself because he's good at comforting himself, I don't need to go check up on him."
Quoted to keep this thread active and noticeable They need to swop the Karlach dock scene and the Astarion dock scene in the running order. A while back there was a poster (not sure if it was this thread or another) who played as Astarion and romanced Karlach, that must have been the most disappointing ending imaginable. You run away from your lover cos you're burning she starts to burn up as well and either dies or goes to Avernus (possibly with someone else) while you are forced to lurk behind some crates and can't comfort your love interest or go with her because you are out of dialogue range. Did larian really think that would never happen or something? If they did that, following Astarion off the docks (if he didn't go to Avernus) would be the most natural thing in the world