I have all three sims. Rarely do I fly XP11 or MSFS. All three are here for our enjoyment, right? Just a matter of taste.
As far as XP12 goes, I would surmise that everyone involved in the project, whether you are: 1) A part of Laminar, 2) A 3rd party dev. or, 3) an end user, are feeling the frustrations from the delays. Those in development, at all levels, I believe are working as hard and fast as they can.
As for LR, I suppose getting the code to be forward leaning and backwards compatible is turning out to be tougher than they originally thought. 3rd Party devs gotta eat and catching food gets a lot tougher when you can't get your products out or they aren't selling because the way the code behaves - causes stuff to break. Finally, if you're you or me then it gets harder and harder to understand why the hell is it taking so long to roll out my beloved aircraft? You might even be starting to wonder if it's worth sticking with X-Plane 12. You know you can't go back to XP11 and the thought of flying full-time in the other sim leaves a bad taste in your mouth. So all you, as an end user, can do is tie a rope and hang on.
I know this doesn't apply to those who're perfectly content with XP11. But for the rest of us all I can say is, "hang in there".