[MiyamotoAkira]

I just want to point about that sentence of "goal posts get shifted". In his book Test Driven Development by Example (2003), Kent Beck, on the preface, page X says: "Red-Write a little test that doesn't work, and perhaps doesn't even compile at first"

There is no goal post moving.

More likely, as we transmit information, we don't do it correctly, and knowledge/data gets lost. I found quite enlightening to always go back to the source.