You're right. They've the money. They've the reviews, the GOTY chances, the tabloid front pages. But you know what else they have? A huge love for their fans. Not many studios allow players to form the game like Larian did with BG3. Hell, Karlach wouldn't even be here without player feedback.
Thus far, they've crunched out THREE ginormous patches within a month of the game's PC release, all whilst working for it to release on PS5 and Mac. If you scroll through the full patch notes, they're near-fucking-endless. And no, there's no way they'll fix all epilogues and endings at once. There' more urgent matters that prevent players from playing the game altogether, and those need to be prioritized.
But they've also stated that they're working on the epilogues AND taking player feedback to update the game in the coming months. Give them time and keep talking about ut. Keep venting. Keep bringing up important points. They will see it.
Hell, there's a new Karlach Discord feedback post every few days and it always earns a shitton of ups/likes. People. Want. Better.