Wouldn't that blow out any earphones that are accidentally plugged in to it? I know most plugs are 3.5mm, but I have a couple of sets that use the smaller form factor.

Reminds me of the first IBM PCs. They had two identical 5-pin DIN jacks on the back, one for the cassette recorder and the other for the keyboard. If you plugged your keyboard into the cassette jack by mistake, it would cost you $200 - for a new keyboard.