So far for an unknown reason (at least for me) there have been no generalists (i.e. those who provided non-wiki answers of 15 total score in 20 of top 40 tags) till now and since today the situation has changed and there are 41 of them. Of course most of them could have been generalists for a long time, however they've become just today.
Why this mathematica.stackexchange cambrian explosion?
What has happened?
Today the same issue with 130 explainer badges.
What is the ultimate criterion for this badge?