Software Update is dumb

I'm updating two Macs via Software Update in the same network and they share four downloads between them.

Why do they need to download the new versions from Apple? I mean, they could just find each other and swap.

This isn't rocket science, at least not in a system that has Bonjour built in.

And its not as this would be terrible security-wyse: all the updates are signed by Apple and Software Update will refuse to install them if the signature doesn't check.

Oh well, maybe in the next cat.