I found out this article by looking at who reacted to my article dedicated to the visual coverage (which you mentioned as the first metric you evaluated) ♥️
https://medium.com/preply-engineering/the-implementation-details-of-preplys-design-system-visual-coverage-86b4a78ad2bb
Very very interesting and definitely what we need right now, Omlet doesn't work for our huge codebase 😊