It really surprises me since there's a developer edition coming natively with Ubuntu (it only exists for the XPS 13 though). Is the underlying hardware that different?
The Precision 7750 supports Linux and supposedly has the same sound system as the XPS 17. Both are 17” laptops and share similar chassis. Finger print reader isn’t well supported. No gestures.
20 years ago I was convinced Linux would win on the desktop. But we still have the same problems decades later.
The Asus EEE PC that I bought (1215B) also came with Linux, when I say support Linux OEMs I meant it, yet not everything worked as expected, e.g. wlan and hibernate were an adventure during the first years.
And then the whole story with AMD open source driver, means I am unable to take full advantage of the GPU in Linux.