They do a nice job of showing everything the iPad is missing in 30 seconds. USB port, memory expansion slot, two cameras, video output to an HDTV...
Your list isn't an objective "everything it's missing", it's a subjective "what you wish the ipad to have".
Question is, do you wish that unreservedly, or only if it could be done without 'ruining it'?
If I expected it to operate as a razor and it could not while other similar devices did have that feature, then yes, I would say shaving capability was missing. That doesn't mean every irrelevant concept I can come up with would be called missing, though. 'Missing' is based on what one would expect, desire and can get elsewhere.