Earlier quoted context omitted.
It's a heuristic not a rule.
Is it? Getting the spacing down so its not noticeable by humans is doing manufacturing and assembly with tolerances measured in whole millimeters. It’s easily the largest possible tolerances allowed within the manufacture and assembly of the car. It should be some of the easiest manufacturing and assembly to be done. If they can’t manage tolerances measured in millimeters, how can they manage manufacturing and assemb…
Yes.
Internal combustion engines require intense tolerances. If your cylinder head is 1mm out of spec you're going to have serious problems.
But if the wire winding bundle for the electric motor is 5mm out of spec? You'll be fine.
The areas in a Tesla where tolerances are actually important- the batteries and PCBs- are subject to completely different engineering practices. Nobody's going to get cross trained from fitting door panels to placing SMCs... which is done by a robot anyway.
Do you (literally) kick the tires of a car before you buy it?