"MIDI" on your Desk may well be done over USB but MIDI as a hardware protocol is absolutely rock solid and is the only choice for live music. Speaking as an occasional backstage gremlin, I minimise the USB proportion of the signal path because reduces the amount of testing required (MIDI is generally well implemented on the hardware side, but not all USB midi interfaces are made equal).
That and a lot of MIDI is instrument-to-instrument rather than to a PC (Or more realistically a Mac, because you have to have a Mac to be a creative, right...)
That and a lot of MIDI is instrument-to-instrument rather than to a PC (Or more realistically a Mac, because you have to have a Mac to be a creative, right...)