I'll substantiate regarding UI: On a Mac it has no items in the menu bar. The default cursor is changed to a low-resolution raster image instead of the default OS cursor. The image metadata pop-ups keep appearing even though darktable is in the background and I'm typing in a textbox in my browser. Something's really off with the UI toolkit they rely on.
I agree with the GP that the UI makes it practically unusable. Prehistoric, and I'd be surprised if this can be used by anyone as-is. I'd take a look at the features, but while it's importing my catalog I can't open any subfolders to look at images already imported. Once I click open my top-level Pictures folder, it closes it again after half a second.
To be fair, this was using Darktable 3.6 (I had to open /Applications/darktable.app/Contents/info.plist to check as there is no About menu). Updating to the current latest 4.0.1.1_arm64 at least the metadata popup issue is mostly, but not 100%, fixed, and I could navigate through my catalog.
Adding: Even though my Fujifilm X-T4 is listed as supported on https://www.darktable.org/resources/camera-support/, and the preview images in grid mode appear, opening a single image displays two visually overlapping error messages about not being able to open the raw file. (One message is about switching to lighttable, the other about not being able to read white balance info. The image is not displayed.)
I agree with the GP that the UI makes it practically unusable. Prehistoric, and I'd be surprised if this can be used by anyone as-is. I'd take a look at the features, but while it's importing my catalog I can't open any subfolders to look at images already imported. Once I click open my top-level Pictures folder, it closes it again after half a second.