Goodhart's Law is shorthand in cybernetic systems for this notion of encountering drawbacks from capturing the sense of something too completely…

How "Goodhart's Law" has been articulated tells an additional story about the development of… signifiers, reference & reflective though:

1975, Charles Goodhart's original formulation, in "Problems of Monetary Management: The U.K. Experience":

"Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes."

1996, Keith Hoskins:

"'Goodhart's Law' – That every measure which becomes a target becomes a bad measure – is inexorable, if ruefully, becoming recognized as one of the overriding laws of our times."

1997, Merilyn Strathern published "Improving ratings':

"When a measure becomes a target, it ceases to be a good measure"

Has the language been tightened up, ready for the history books? It's economical. If David Deutsch consulted Strunk & White, maybe he'd call it, but why set something in stone when it's part of an open ended process?