What I want is some hardware that, if Linux stops working on it, it's someone's job to fix that.
Which is why I'm strongly considering a Steam Cube.
The great thing about open source is that there’s always at least one person who can take on the job of fixing your obscure hardware problem…you.
The terrible thing is that you are probably unqualified to do driver surgery without taking on more work than the problem is worth to you to fix.
I installed Bazzite on a NUC, and what it did was really sell me on getting a Steam Machine. Bazzite works well enough, but it has a few small bugs (e.g. performance degrades if I run Gamescope), and my NUC is old and underpowered. The general Steam experience, though, is fantastic.
It's basically a PC console, except it's not locked down to hell, and I already own hundreds of games for it. I'm very excited for the first-party hardware. If it's anything like the Steam Deck, I'm going to love it.
A thinkpad then? Not exactly someones job, but hardware support for them is very good.
Even if you run fully Valve hardware you are still going to be subject to the usual finicky-ness when connecting external devices (e.g. if you use multiple monitors, issues with the open source AMD GPU drivers; etc.).
you can get that both from Lenovo and Dell
RIP Zareason
What about a Mac? macOS isn't exactly Linux, but you can run a lot of Linux command line things just fine on it, and Apple will always make sure macOS works 100% on the Macs they sell.
What about Framework? They support Fedora and Ubuntu: https://frame.work/fr/en/linux