I think the point (something I struggle with personally) is more that even if you do happen to know the ideal way to do something, it doesn't need to be done that way, and letting someone junior figure out how to do it their own way can still be sufficient. That has the added bonus that the junior will learn much better than if you were to dictate their path exactly.
Of course, sometimes letting a junior engineer do something their own way can fail to be sufficient entirely; knowing your junior engineers and their capabilities well enough to know how much rope to give them on a particular task is yet another skill to be honed.
Of course, sometimes letting a junior engineer do something their own way can fail to be sufficient entirely; knowing your junior engineers and their capabilities well enough to know how much rope to give them on a particular task is yet another skill to be honed.