I really don't know one game that ever delivered on everything that they have promised so I would look at things realistically and ask myself if overall, what they delivered was fun and enjoyable to play.
Honestly, if your expectation is that your going to get everything that a developer promises in every game, then you must suffer a lot of disappointment with your gaming experiences. There are just so many things that sound good on paper and may even sound feasible in the conception stage but end up not working as intended or become unfeasible for many reasons, that they need to be cut that I sincerely doubt any project has ever delivered 100% on how it was concepted.
Every game has these. For example originally in Bannerlord you were supposed to be able to grow a village into a castle and eventually a town. The player being able to found a village, then grow it into a castle, then finally a town sounds amazing.....when you look at it as one village being upgraded into one town.... however, you take it to the logical conclusion and every village and castle in the game would eventually be upgraded to a a town, what then? Obviously you have a broken as hell game. Promise not delivered, game better because of it in my opinion. However, as you point out, they failed to deliver their promise so they failed and we can't take any of their promises seriously anymore. Obviously this isn't logical.
At the end of the day, sure, a developer should attempt to deliver as many of their promises as they feasibly can but they key word there is feasibly. What we need to judge is how close they came to delivering what they promised and remember, just because a game is released doesn't mean things can't be added. Taleworlds can absolutely add things down the road. Hell a prime example of this is No Man's Sky. They completely over promised and undelivered however, they didn't stop working on the game just because it released and now it is an amazing game.
Anyway, it has been nearly a year of Early Access. Taleworlds needs to start wrapping it up. Fix the major issues, deliver on what they can and release the game. Modders will fix most outstanding issues once the game releases. Then, like No Man's Sky, maybe on a quarterly basis, Taleworlds can patch in a large content patch adding some of the stuff that didn't make the final cut as well as adding new feature and improving the game. I can guarantee you that the player community will appreciate a strong commitment to periodic improvements over time more so than taking another 6 months to a year to add a few missing features and then abandoning the game once it is released.