FWIW, I have an old steam link. I can’t remember what video settings I was getting. But I know they weren’t 4K/60hz. I ran one additional cat 6A Ethernet wire to a dedicated KVM from my desktop to my living room OLED TV. I’ve been very impressed by the result. I’ve mostly played a lot of my old favorites on various emulators. It’s been very nice playing through the metal gear solid series in upscaled 4K and avoiding that crap collection that was just released by Konami.
The steam link is cool and I’m glad to see Valve still supporting it all these years later. But the flexibility of a KVM is really nice. I watched a Steelers stream today just using my TV as another monitor basically. And KDE big screen is very nice for navigating things with a controller and not trying to read tiny text in 4K resolution lol