Nobody can blame you for thinking that coz that's truth.
As a big fan of Philly's art and his 2 games (DA and COBD), I'm also really disappointed with how the story unfolded in the last few chapters, especially with the sex scenes that seem repetitive, and most of them even plain boring, like some users said... not even Shanlon's scenes have that 'it' factor to spice things up anymore IMO. Victoria and Shanlon (for those players who play her route) are supposed to be the most experienced and perverted, kinky, open-minded, whatever you wanna call them, women in the whole game, but their scenes got boring pretty easily, since there's not much new stuff to see, not even on Vic's spellbound path.
About the story... sadly, things don't look so good. Either Philly doesn't know how to continue it coz he suffers from writer's block or got burned out after working on so much stuff for the game and those rewards for his high tier supporters. There were a lot of things you mentioned in your post with which I fully agree, and it's really disappointing to see the big potential the game had till Book 2 was released being wasted in every new update. I find it kinda funny that I expected to see the MC and his group already infiltrating Baynard and do some damage, given how Ch12 ended, but instead we got another delay for the next chapter and more sex scenes that seem out of place. Personal opinion.
I sincerely hope I'm wrong on this, but I'm not so optimistic about seeing a good, satisfying and logical ending after all those recent fuckups.