Forgive me if this has been done to death here, I’m relatively new to this sub. I personally always felt it was more poetically beautiful for Bojack to die. The tragic (anti)hero meeting his end after a chaotic life of destruction to himself and everyone around him. I don’t hate the ending we have, but I always felt there was a certain beauty and closure that felt right
If he died, there would be no opportunity for him to turn himself around, nor any opportunity for him to reckon with all the wrongdoings he has done throughout his life. It would completely tear up the established moral of the show.