Ah yeah, this was the line I read a bit too fast:

Any modern Linux distribution should basically be in good shape for the AMD Ryzen 9000 series processors. The one recent caveat is needing Linux 6.12+ for the AMD Zen 5 CPU power reporting if that is important to you otherwise it’s an easy one-liner patch to backport.

Compatibility for desktop pcs is a whole lot better nowadays. Main thing to check is the motherboard; Bluetooth, WiFi and BIOS updates without windows can be pain areas but even that is getting rarer. Laptops require some more reasearch.
If you’re going cutting edge (AMD Ryzen 9800X3D) then you’ll need kernel 6.12 or higher.
Here’s a Linux review of the 9800X3D - https://www.phoronix.com/review/amd-ryzen-7-9800x3d-linux

I second this. OEM machines usually come with weird caveats where they saved money on the PSU or other parts that isn’t used in their marketing of the machine.

In my country many online computer stores offer to prebuild your custom pc, offering warranty on the whole build.
Great if you don’t have the time to put it together or if you want the warranty offered.