When human expression is at stake spray and pray has always been a basic tactic. It's not easy to get the real magic out of a face. With still life you can afford hours of preparation and a few single shots. With people you can as well, but the final result is not guaranteed to be the best.

For certain types of photography, spraying is the normal way to go:

https://www.youtube.com/watch?v=wygqlfUoJEs