I almost agree with OP.
1/ Why Emperor so easily betrey us, why can't we talk, if we were good allies, if we trust each other, why not consider other options?
2/ Why not show how after big victory everyon is celebrating, after goblin/tiefling there is some celebration, why not after major battle and great victory?
3/ Why not show in cutscenes and in conversation on final celebration what our companions is planning to do with life and freedom? Why ending feels so cut and abrupt.
Why our choices don't matter? Why there no cutscenes or slides with our choices and consequeences?
Why not show how is Driud Grove in ending, who new ArchDruid is rulling? Why not show how is 7k spawns in underdark if we released rthem, or how is brothers and sisters of Astarion if we killed 7k spawns. Why not show how Shadowland after some time, how there is Oliver and Thaniel playing together. And I can continue a long list of choices that we made a long side of game, that seams not matter at all.
Where is promised 17k endings?
I love game. Game is amazing, but last 20 minutes with final cutscenes and battle seams so empty and dissapointing, we spend so much time with our companions, we went through everything, we helped them solve their problems, and in the end there is nothing. Nothing at all, like we some straingers on a pirs.
I hope for patch, or dlc for ending, like it was for Mass Effect 3.