I have read many accounts of the art of saw filing and how the relative randomness of the human sawtooth filing stroke makes for a smoother cutting saw.
From my limited experience filing saws, "relative randomness" of your teeth does NOT make for a smoother cutting saw. Especially if you end up with random tooth heights in the process.
One curiosity of mine, if Pete would care to answer, is how many saws a day can a machine file compared to a person filing?
Also while the machine is filing can the attendant be taking care of other business like packing and unpacking other orders?
If a machine can increase throughput maybe it is wise of a business operator who uses such an advantage.
My guess is a machine can also help to avoid a lot of headaches from eye strain.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)