Parade March is a thing we don’t bother to drill into units (except specifically tasked “Parade Units” that exist to do little circus acts for the high command’s amusement).

That is not accurate.

https://youtu.be/aeFltEjzR2Y?t=1212

Soldiers utilize D&C every day, by and large. Even when running. Its how soldiers are moved, as a group, from point A to point B.