If you look at many trades, they have changed so much within the last 30 years, mostly in the materials they use and the techniques to work with those materials. Plumbing, building electrics.
200 years ago, a 'Master Plumber' was a guy who could dig an open drain in a straight line. The old panelbeating skills were something that would give a tradesman a sense of pride and accomplishment to look at a rebuilt mudguard or panel alignment. And not all panelbeaters were highly skilled either.
" Rule books are for the Guidance of the Wise, and the Obedience of Fools"
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