Thanks, John. I'm just asking out of professional curiosity. Regarding the examples, it's difficult to analyze specific URLs considering that millions have been lost and the sample of the crawled not indexed report is limited to 1.000. So far it hasn't impacted much, but some traffic has been lost.

These one, for example. - 3.5 M of indexed pages (that has been classified as "Crawled, currently not indexed"). Quite interesting in a stable project without noticiable changes.