>> There are fields of work where it’s easy to gauge productivity, but software development is not one of them.

I manage a team of developers / analysts and it's straightforward (though not always easy) to measure this over several six-week blocks of time for the team. It is not, however, easy to measure it for any single developer or analyst, and there's a lot of variance when you try to look any more granular than the team.

I suspect it's doable for small groups that work together. Or even larger groups. (I have no experience here.)

But for individuals? I agree. No shot.