degen I still have Windows XP installed on the old PC, but it's not like it's very useful nowadays for anything else than some retro games, let alone secure for online use.
I have a jailbroken PS4 that I have installed an Arch Linux on (psxitarch) some days ago. It seems the Linux eye strain is not there on the desktop. So there may be hope that it's not Linux's or X11's fault. It may all depend on the GPU/driver. The PS4 is x86_64, but sadly has no graphics card that is compatible with a regular PC. As I don't get Wi-Fi nor Ethernet to work, I can't use the PS4 as an Internet PC.
The PS4's CPU/GPU is from AMD. Maybe it is time to explore more recent AMD GPUs/APUs, just in case they have changed something. I remember some years ago we avoided AMD due to their alleged temporal dithering and instead focused on Nvidia cards.
Take all this with a grain of salt as I have only used the PS4 Linux for some hours and not used anything hardware-accelerated yet. Sometimes the first impressions can be wrong.
The last AMD card I tried still used the old radeon driver instead of the newer amdgpu driver. It seems the newer cards are based on a new architecture. Perhaps they are eye-friendly on Linux? To know that I would have to buy a whole new PC with the risk of not being able to turn it into something usable. The amount of money we have to spend on our eye strain journey is unreal at times.