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It is not uncommon for engineers to accept the reality of phenomena that are not yet understood, as it is very common for physicists to disbelieve the reality of phenomena that seem to contradict contemporary beliefs of physics.
— H.Bauer

An elaboration on No Plans No Prototype No Backup.

In engineering terminology, a "black box" is a device with one or more inputs (cake ingredients, a excerpt of text in Mandarin, iron ore), one or more outputs (cake, the same text translated into Frisian, a battle golem), and internal processes that are either:

1) irrelevant.

2) unknown and/or unknowable.

Such technology falls into the hands of some organization, usually the military or a commercial business. The original creator is dead (or is an alien, or otherwise can't be reached), but said technology is really convenient. The organization's analysts went over the thing, and while most of it makes sense, there are these elements, either program or device, that they cannot comprehend at all. Removing them causes the entire thing to simply not function. The organization may be able to reverse-engineer copies, or lesser versions, but they don't understand how it works.

So, since the financial bottom line or military advantage is so important, they go along with it anyways.

....yes, of course, the technology has a bizarre effect that nobody could have predicted - you really need to keep track of those inputs and outputs! Usually it's in the form of acquiring sentience or a bizarre weapon, or only being able to be used by people of the show's target demographic. (It's common in Humongous Mecha series.)

Compare Scavenger World, where everything is similar to a Black Box not by conspiracy but by The End Of The World As We Know It.

See also In Working Order. Sister Trope to Disposable Superhero Maker.

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