Tbh I feel like, what is the important part of a story for someone?
Is it all about stopping the Big Bad?
Or is it about the journey? The friendships you forged, the lessens you learned, maybe even about the friends you lost along the way.
Look at LotR, is this a story about destroying the Ring and Sauron? Or about Frodo sacrificing everything and himself? About Sam staying at his side no matter what? About Boromir redeeming himself by sacrificing himself. About Merry and Pipping growing above themselves and discovering how much more they can be, how much more they can do?
Some people would tell you its all about destroying the Ring. I would tell you its all about the people.
And I feel like at Larian there are quite a few people who would tell you its all about destroying the Brain while I find, in the end, the Brain is the most inconsequential thing about this story.
For me its all about the wonderful companions, what they've gained and lost along the way. How they have grown and changed and risen above themselves.
So, from the pov of Larian they gave us what was important. The big fight against the Brain and the satisfaction of defeating it.
While we feel like the most important thing is missing. To stay at the LotR analogy - the frikking last 6 chapters of The Return of the King. Tolkien gave us 6! chapters after Sauron was defeated.
Imagine LotR with out its last six chapters (And I will never forgive the movies for scraping The Scouring of the Shire).
And that is what we have. A little joke, a few lines. But nothing else. B/c the Brain is dead and that what it all was about.
I am not saying this pov is wrong. That is what a story is about for many people. But just as many don't care about the Big Bad. They care more about the people who stood against the Big Bad than the Big Bad itself.