Obviously, but that would only be relevant if official status would fix broken features, not the other way around. In other words, in order for a device to become official, work already has to be done to fix all those features. When that work is done those features are already fixed in unofficial builds, so official status is just a distinction saying that all these features work. Being unofficial is not why they're broken -- no one being able to fix them is why they're broken.
I see. I think you're looking at it from the perspective of realistically assessing the situation we're already in. From that perspective, the official status that we'd had up until this point is actually misleading, because of the very set of deficiencies which is currently disqualifying it from 15.1 support.
I was thinking in more of a general case: If there was a hypothetical possibility of having an official build of 15.1 or newer, and we were asked to compare that hypothetical possibility against the alternative of another build that was unofficial, I would have preferred the official build because of the assurances of quality control which accompany that status.