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It was surmised that the asymmetry could be attributed to its exclusive use by barbers to shave others, which is to say that only when you barber can one sided use be employed. Which I don't believe...

That is a cool one Bruno. I was really intrigued by this one which is sorta the opposite. A western style wa-kamisori

I have a question: What is there to shaving another, as barbers did/sometimes still do, that precludes the use of both sides of the standard straight?

I am 99.9 % sure that your barber will use...