I'm not sure where this thing about Kamisori being designed for folks to shave someone else with got started.

Stop and think about it for a minute. Do you think every Japanese man and Woman never shaved themselves and went to the expense of going to a barber every day or would put up with a razor designed for another person to use on them? It seems kind of ridiculous doesn't it?

Sometimes when we use something that seems alien to us and we don't quite understand we make things up so it fits our reality.