XPS sort of does that, but you're still dealing with Dell which has it's own hiccups (variable build quality, archaic sales methods, etc.), also the XPS line isn't quite commercial grade. Thinkpads typically have good Linux support, but sometimes as with these last 6th gen X1's it takes some work to get it right.

The hard part is ultimately enterprise reliability. I want to confidence I can buy 2000 of these for my army of engineers and not overload IT with issues. This kind of support is common enough, but not necessarily for Linux laptops. Hell it'd probably be easier with Linux, the issue is more if the market is big enough to support the operational costs of enterprise support.