The problem simply is that most things are very hard to measure directly if not impossible. "When a measure becomes a target, it ceases to be a good measure."

The problem simply is that most things are very hard to measure directly if not impossible. "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