The only thing was… it was very easy to destroy a device (keyboard for example) if you hot-plugged it. I lost a keyboard or two (well, my employer did) because

The only thing was… it was very easy to destroy a device (keyboard for example) if you hot-plugged it. I lost a keyboard or two (well, my employer did) because I plugged in a device without first powering down the Mac. (Unlikely the ADB protocol though? I wonder if this is one of those examples where having some pins longer than others so they get electrical contact first could have prevented the problem.)