If you're coming from the likes of Lightroom or Capture One you will have to learn a very different way of working, but in return you get a lot of control over the edit.
Better is subjective, but the editing is much more powerful. However, it's also a completely different editing paradigm (largely on-rails vs. layers/nodes), so some acclimatisation is required.
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.
OpenCL is deprecated, not unsupported, on MacOS and may be removed at some point, but it absolutely does still work for now. If you don't have OpenCL acceleration, it's a bug.
If you're coming from the likes of Lightroom or Capture One you will have to learn a very different way of working, but in return you get a lot of control over the edit.