It changes where the damage "hits" in the animation, which can make it feel slower than it actually is. And you gotta be good about queueing your next attack, or then it'll play the full animation which is lame. But it's less of a problem now than it was, which is nice.
But yeah, it's more important on a Bane than a Crab, which can kind of partition ST to the gun and AoE to the legs or just go full crab people if it wants.
VEATs were the ones my testin' buddies and I tested it on; we originally were testing switching between mace for Shatter Armor and claws for Night Widows (which is its own can of weird spaghetti code worms), and they're the ones most affected by redraw issues most of the time.