“you can even plug in a keyboard”…

To play Doom…

That’s running in a key on your keyboard…

Not sure why he didn’t take the extra step of tying in the power and keys from the USB keyboard the keycap is living on. I feel like that shouldn’t be too hard

What exactly is the obsession of putting DOOM of all games into any hardware over other games?

It’s a fine enough game, but definitely not the game of choice I would choose if I were to choose an old game to be put in random hardware.