I get my knowledge from the data published by John Deakin and the other APS people.
No, I'm not sufficiently educated.
It is astonishing, though, that despite everything advocated by APS (and "Savvy", whatever or whoever they may be) contrary to OEM publications, they've never been sued for giving negligent advice. I wonder why, given that they live in the land of litigation at the drop of a hat. (Actually, I don't wonder why...)