My mans I feel you but I really think it's going to be fine. The game came out roughly 70 days ago, that's like one Hoi4 focus, and they've already given us so much. So far they've dealt with all of the easy stuff, now they're moving on to the more complicated stuff. It's not just Karlach's ending too, we also likely get to look forward to:
-Epilogue Scenes -More Wyll and Minthara content -Whatever the hell is going on with Halsin -Better Durge endings
Larian has already showed that they listen, and they've accomplished so much in so little time, so we really just need to be patient. I know we're supposed to keep our expectations low blah blah blah, but I genuinely think it's going to be fine sooner than you think.