It’s very high risk and low reward. I have heard of a very valuable employee quitting on the spot when they discovered their manager was doing this kind of analysis.
It has greatly demotivated me to learn that productivity was measured by commit count in one of the companies I worked in. Interestingly, I was the most "productive" engineer there at the time. Yet my code was garbage (no offence to garbage intended). This oxymoron showed me that there's no path for me to improve in that company and I soon left.