As the one responsible for writing much of the FAQ, I can assure you that's not what is meant. The point is to hopefully make new users aware that they can't assume their Lightroom knowledge will help them, and thus encourage them to consult the manual or some tutorials. It's an unfortunate fact that many coming from Lightroom think they already know everything and don't have to learn anything new, but when they fail to make head or tails of darktable they conclude that the issue is that it's trash and not that they didn't bother educating themselves - and they will often loudly proclaim this on Reddit in a rather entitled manner.

But yes, the library features could do with some improvements.