I didn't really expect this to be a hard thing to find - I'd like to add Bluetooth to my desktop PC (X570, 3700X, etc.). I'm agnostic about wifi inclusion - it's happily plugged into the wall, which ...

Desktop computers are generally used in a fixed location - size and weight, the need of external keyboard, mouse and monitor(s) all decide where you can have those machines in your office or home. But ...