Measuring against estimates incentivizes over-estimating, especially if the team is small, and team members know roughly who will do what during the estimation process. Big complicated tasks also tend to be under-estimated, so they would be avoided, because they would usually influence the perceived productivity negatively.

I would like to find a feasible approach to productivity evaluation using the output only (PRs, reviews, basically all the data points the article mentions), because I feel that’s the only way of creating an environment, where team members can proactively take a bit more time when it benefits the end result, without fearing any negative repercussions.