The problem: you unplug something, plug is sitting on the floor and you get up in the dark and walk on it!
Ouch! Just reading that makes me think of the times it's happened to me, particularly as I tend to go around the house without shoes on.
I can't say that I'm over-impressed with the 16A IEC-type sockets. When used in high-current applications (e.g. kettle), many types seem to end up with burned and overheated contacts in a comparatively short time.
