What?! Even the humble CD32 has a keyboard/mouse interface and we are talking about 1994!
To be fair, the CD32 only has a mouse interface because the Joypad connectors are standard Amiga joystick/mouse connectors, and it doesn't have a keyboard connector as standard either.
Also, the X-Box does have controller ports which can be easily modified to accept USB controllers (according to the same faq).