The memory card ..... It was originally designed to even allow gaming on the card like a mini gameboy when disconnected. By now it would be. A steam deck that acts as a controller.... Huh reminds me of the vita.......
The fact that nobody has done "screen in a controller" since Nintendo toyed around with a handful of Gamecube-GBA games is a crime. It was a cool ass idea that got displaced by internet lobbies before it got off the ground.
edit: yeah I know Wii U too but that's not what I mean, that's something else.