Yeah, it's not a problem that a particular person does not know it all, but if no one knows any of it except as a black box kind of thing, that is a rather large risk unless the system is a toy.

Edit: In a sense "AI" software development is postmodern, it is a move away from reasoned software development in which known axioms and rules are applied, to software being arbitrary and 'given'.

The future 'code ninja' might be a deconstructionist, a spectre of Derrida.