> Repairing a mechanical watch for example requires fine motor skills, decent eyesight, impeccable patience etc.
No. What I said was that certifying someone does not give them magical abilities.
Two people who have equal motor skills, eyesight, and patience (etc) have equal ability to repair. The one without official training just has to learn through experience.
Not all humans are created equal.
Repairing a mechanical watch for example requires fine motor skills, decent eyesight, impeccable patience etc.
And modern day electronics are fast approaching that level of complexity.