Clearly you've either never marched in a hornline, or you just weren't paying attention. At all.
Anyways, the amazing thing about Space Chords is that you can do some amazing stuff with it, especially at lower dynamic levels. Anyone can play loud, only few can play incredibly soft. Space chords at ppp REALLY help you find the center of your horn for a great resonant tone, which is extremely difficult in the softer dynamics.