Some devices (mostly security devices) trigger things based on the physical connection state, cycle count, etc. and it's useful to have a means to test these.

Some devices (mostly security devices) trigger things based on the physical connection state, cycle count, etc. and it's useful to have a means to test these. I've never seen a device so far that has a physical switch to make sure it's really been unplugged, but I'd imagine someone could find a use case.