> 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.

There is nothing about the use of microchips that forces you to make the way in paper thin glass glued to the case. We invented PCBs for a reason.