More Dakka is a form of Spam Attack with bullets -- the art of solving problems by firing as many rounds at them as possible. Improbable Aiming Skills are all very well and good, but sometimes you just need to throw a wall of bullets at the target -- perhaps your foe can Dodge the Bullet, or you're up against a whole army of Mooks at once. Modern automatic weapons can achieve the rates of fire required for more dakka all by themselves, but using a whole bunch of slower-firing guns works too. More dakka can even work against targets where conventional attacks are normally ineffective -- even if each shot only does Scratch Damage, it will succumb to a Death of a Thousand Cuts eventually.