So here’s the thing.
Anil Dash

You need to thinnk about this scenario:

  • User who has always used wired mice in the past
  • Gets Magic Mouse, plugs it in via lightning cable
  • Leaves the cable in for the rest of the mouse’s operational lifespan

This design solution prevents that, and that’s important to the overall design philosophy of ‘sans wires’ that Apple has thoroughly adopted right now.