I've got Windows 7 at 125% running on a 70some inch TV off a tiny Optiplex Micro with an i3 or something, and a fork of modern Firefox for w7, hardware accel and all. I use my phone as a bluetooth touchpad/keyboard with an app that was maybe 5 bucks. Best 10-foot interface I've ever used. Everything works exactly as expected, no fuss, no gotchas, no friction, no workflow-breaking updates. And I never lose the remote!

This (plasma-bigscreen) is going to fail, as 10-foot interfaces historically do. It is a waste of good developer time and focus.

Free Desktop people keep obsessing over ill-advised moonshots as a form of escapism; no one wants to address the fundamentally broken core desktop model. Papercut bugs are boring and solving them is thankless. Working on a shiny new TV mode interface looks better on a resume. Meanwhile the rest of the world is pulling their hair out over Windows 11 and macOS Tahoe because there are still no feasible alternatives for normal human beings.