Isn't that what System76 does?
No, they sell it with Ubuntu. It works when you get it, but Canonical doesn't test new updates on System76 machines. Which means it will break. Because that's how much Ubuntu regresses.
I want the hardware and the software manufacturer to be the same company. I think that's the only way an open source OS could get sufficient funds and a sufficiently narrow group of hardware to support.
I guess the closest thing to a problem-free Linux experience would be the Dell developer edition laptops or maybe the Thinkpads, as Lenovo usually Ubuntu certifies them.