I'll say what I said before... I think you're looking at it thru the lens of today. He was sharpening knives on a commercial route... not knives that were of high value, and came up with the EP as a "faster than hand sharpening" method. The EP Pro was specifically designed to eliminate "dishing"... allowing the whole stone to be used and remain flat. It could be done quickly because he sharpened at a common angle... one or two stones, and quick debur (see videos). Light pressure, minimal effort, designed for comfort... all part of the package.
Today we have the view of: high dollar knives... must tape up.... carefully set angle... 1/2 dozen stones process (minimum)... OMG one side is 1/2 deg. wider than the other, must start over....
As for the... too much pressure caused by the setup, mentioned in the other threads... then, if this were true, if I took a knife and made a tip repair (no EP)... putting a spine or edge 90 deg. on a diamond stone (very small surface)... can I not control the pressure to prevent destroying the stone?