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Actually the extensive work involved in making tamahagane blades is exactly what makes them very special, as an exceptional smith like Iwasaki could turn out 65-67HRC blades that don't chip because...

Jimmy, I honed an Iwasaki western @ HV 860 which = about 65HRC. Just awesome steel, hard yet ductile, not chippy at all but did require a lot of time & trips back to the hones. Never at any point...

I'd be surprised if 'average' tamahagane razors would be very high HRC like Iwasaki san's. Certainly Nihonto were not & razors were often made as a sideline by the smith.