Interesting piece of shaving history (sorry if repost).
I suspect that three such passes may be a modern invention of shaving hobbyists. In years gone by I think shaving was for most a utilitarian function to be done as quickly as possible. I consider that I am a 'traditional shaver' but I bet my Father and Grandfather would regard three passes and anything more than one razor, one soap, one brush, and one aftershave as madness and a total waste of money. They would consider me some sort of eccentricno WTG/XTG/ATG
Yep, anything more then 1 soap/razor/brush would my grandfather consider unnecessary.