Comment by joe_the_user

Well yeah...

You could pretty well describe the software methodologies of the last twenty years as being over-generalizations of basically good ideas. Once a given reasonable idea has pushed beyond its usefulness, the opposite good idea appears and ... is pushed beyond its usefulness.

Tossing out understanding and just having tests and code can easily result in disaster in many cases (compilers, sudoku solvers, etc) while over-designing can result in the opposite disaster in other cases.