I turned my streaming stick into a dumb app launcher, and that's all it should be

Great, now do iOS, Roku, and whatever Amazon is pushing these days. Oh, and raspberry pi and NVIDIA shield.

Dude just switched the launcher, should be doable on most Android TV devices.

Raspberry Pi can run Android TV, so you probably could run this launcher. Nvidia Shield is already compatible.

The others are closed systems I assume, I have no experience with Apple or Amazon devices.