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>I wish I could watch a program, while showing my computer hdmi input picture-in-picture. Hell this thing has 4 HDMI inputs on the back, let me do each input to a quarter of the screen. Another niche use..

I've seen some business monitors that will show a 2x2 grid of your inputs. I think you can get some sort of device/box to add this feature to existing screens.

I really wanted this feature a few years ago, but hadn't thought about it lately. I wanted to turn a 65" 4K TV into 4 1080p monitors, basically. When a PC is hooked to it, I run i3wm, but this doesn't handle cases like someone hooking up a game console or another PC and wanting to show both. Maybe with some capture cards you could display other inputs in mpv.

If we could put our own software on TVs or swap out the boards with more hackable ones, that would be cool. Just buy a dumb display with speakers and let the free software community handle the rest.