> Heads up: Medium isn’t using this tool anymore, but you’re welcome to!
The problem with things like this is the typical engineering mindset, when shown a graphical or numerical analysis of their performance will zoom into analyse every detail and in the end it's just backed by the managers impressions and judgement.
For similar reasons I have a strong opinion that engineers shouldn't be paid performance related bonuses, because no matter what happens, it's just going to upset them - the best case - maximum bonus - just equates to a "meh". Better to pay a good base salary upfront ...
Anyway use tools like this with caution IMO.