"Power-controlled remote pressers. This is utterly cursed, but hear me out: I want a gadget that I physically attach to a remote. When the gadget gets power, it presses the “on” button on the remote. When it loses power, it presses the “off” button."
Except that too many remotes have one button, and one signal, for both on and off. TV and cable box remotes out of sync is the most common result.