Exactly. It takes a special kind of crazy to go charging into an area where someone's laying down machine gun fire. Of course hyper-agile adepts and street sammies are usually that special kind of crazy, but there you go. For most people, they see wall of lead coming at them, they get behind the closest cover they can find, or hit the deck. In either case, that means your buddies can now either close in, or take up the next position if you're using suppressive fire to cover an escape, taking turns laying down cover fire as you 'walk' back from cover to cover.
There are other uses, as well, but this is not meant to be a lethal tactic, but a stalling one. And it is one that works better with the composure rules from WAR!