It seems they tried samething more comprehensive before the release (upper city of Baldur's Gate), and decided against it sometime before the release. We already got the camp epilogue, so if anything I would rather see further refinements to that (when I tried it some reactivity was off, but it being a launch save things might have gone wrong due to patch difference).
As others mentioned, there is a vast amount of variables, but a comprehensive epilogue is bound to miss/disappoint someone. Leaving things to imagination is often a better option, as far as reactivity is concerned.
That is not to say, that I think ending (and third act in general) could be a bit better in wrapping up existing characters and plotlines. It would be nice if Larian was cooking some additional stuff, but I don't think new epilogue chapter is something the game would benefit from.
