The point is, the UI looks vaguely similar to Lightroom, and many people come to Darktable expecting a free clone of Lightroom. Scores of these people then hit

The point is, the UI looks vaguely similar to Lightroom, and many people come to Darktable expecting a free clone of Lightroom. Scores of these people then hit the forums and complain about "missing features" and "incorrect behavior" and such. It's a real problem, and happens very regularly. That's why they try to put it front and center that Darktable is not Lightroom, is not trying to be Lightroom, and should not be expected to work like Lightroom.