Over a decade ago, my father would fix washing machine controllers, replacing mechanical timers, buttons, panels, or other parts; Now, for the same problem, we just need to replace a control circuit board; the circuit board itself is sealed with adhesive for waterproofing, which also means the circuit board is not repairable.

Maintainability is actually not a mandatory standard, but a design trade-off; the biggest problem with the MacBook is not this, but rather that Apple does not allow other means of repairing the MacBook, such as various certification chips, etc.;