When it comes to Linux laptops, it is pot luck.
The Dell XPS 13 and Dell’s Linux workstations are OK, but their general support does not handle any support matters for Linux. Dell general support has to forward any Linux technical support tickets to the internal Dell Linux division.
I don’t know about Lenovo support of Linux, but my guess is that it has its own quirks similar to Dell’s.
All the white label vendors out there - such as System76, Tuxedo, Kfocus, etc - they’re all using Clevo or Tongfeng laptops. There are two problems with this arrangement…
Clevo and Tongfeng are configured for performance, but they cut corners on build and component quality. For example, it is 2021 and yet there remains no 350 or 400 nit display on Clevo or Tongfeng laptops. Also, both have notoriously bad cameras and speakers. Considering that people are paying Dell and Lenovo prices for these Clevo\Tongfeng systems, I would expect that people would demand more for what they pay.
Then there is the issue of “collaborations” between Linux OS distro developers (Tuxedo, Kfocus), hardware manufacturers (Intel, Clevo, Tongfeng) and white label re-branders (Schenker\XMG) and you end up with laptops like the XMG Focus 15 or the Kfocus laptop. Now how long do you think support for these systems will last ? You’d be lucky if it was 5 years. And if you switch from a “proprietary” Linux OS distro, such as Tuxedo for example, and switch to Ubuntu and you run into problems - then neither Tuxedo nor the white label re-brander nor the hardware manufacturer is going to help you. They will say “go ask on the Ubuntu forums.”
The XMG Fusion 15 with the Tuxedo or Ubuntus OS on it is a perfect example. XMG is not involved in any support of the Linux OS on it. They have to defer everything to mostly community fixes, workarounds and Tuxedo itself - which I bet won’t support the current model for long. As a side note, Tuxedo was also the one that assisted with bringing the Kfocus to market - a Clevo system with a customized Kubuntu OS on it. When you need support, there are like 2 or 3 knowledgeable people that you can get on the phone at Kfocus. However, once these people move on in life, you’re left with a $2,000 unsupported machine.
Looking out there, Linux laptops are a dubious investment - when considering how expensive they are relative to what you get.