This means you're always relying on wireless connectivity (more on that in a sec) but also that you've always got a battery ready to go, and it's admittedly pretty neat to rip out that battery (like a clip from a gun) and slide a fresh one in.
If one of these spent shells is in the chamber, racking the slide will, in a single fluid motion, eject the old shell out the side of the gun and push a fresh round into the chamber.