Indeed, this is true. I've often been super frustrated by things that receive MIDI: they don't expose certain controls to CC, or they don't respond to multiple

Indeed, this is true. I've often been super frustrated by things that receive MIDI: they don't expose certain controls to CC, or they don't respond to multiple channels, or they don;'t pass certain information to the Thru port. But often what is frustrating is that it's do-able in MIDI, it just wasn't implemented well on the device.