The idea of encapsulation is the very reason that we have most APIs.
The idea that you don't NEED to know how something is implemented is always going to be better, as long as that lack of knowledge does not compromise the integrity of the systems or lead to perverted incentives.
What good is a car that requires an intimate understanding of the underlying engine and brakes and gearbox. It might be handy if you are an enthusiast of a racing car driver or pushing the limits in some other dimension.
What good is a toilet that requires you understand the sewerage system?
But for the masses, encapsulation and the hiding away of knowledge is the primary goal. Encapsulation creates specialisation, which creates productivity, which creates prosperity.