no doubt everyone is getting a sharp edge and also that getting a sharp edge can be accomplished without a basic understanding of physics.
If everyone was getting a sharp edge we wouldn't have a thread about someone all of a sudden discovering a new level of sharpness.
Yes, people can accomplish sharpness without a basic understanding of physics.
Just like people without any knowledge of electricity can turn on their TV. People drive cars all the time without knowing anything about the basics of mechanics. People walk to the sink and get a drink of water without any understanding of plumbing.
When the day comes that the blade isn't getting sharp, the TV isn't working, the car is stopped by the side of the road or the water doesn't run, it is beneficial to have some knowledge so one's wallet doesn't get drained by those who took the time to understand some of the basics of various things around us.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)