I think what you are describing is a case of Goodhart's Law: "When a measure becomes a target, it ceases to be a good measure." https://en.wikipedia.org/wiki/G

I think what you are describing is a case of Goodhart's Law: "When a measure becomes a target, it ceases to be a good measure." https://en.wikipedia.org/wiki/Goodhart%27s_law https://en.wikipedia.org/wiki/Goodhart%27s_law On the other hand, a true accessibility score (for example, one awarded by a human or a robust grading process) could reliably quantify accessiblity. Goodhart wouldn't apply in that case.