Is while (MIDI_USB.read()) { } required when using USB MIDI?

[m-r-m-s]

I have been mainly working with the Arduino MIDI Library using DIN MIDI and now starting to explore USB. I am curious if this while loop usage is Teensy specific or is it good practice in general or only when coding for MIDI controllers? I believe this prevents USB buffers from filling up with incoming MIDI messages? Thanks for any insights and advice.

while (MIDI_USB.read()) {
    // ignore incoming messages
 }

https://github.com/PaulStoffregen/Teensyduino_Examples/blob/master/USB_MIDI/MIDI_name/MIDI_name.ino