Hi Alan!
So in Magento 2, you can build rule based category assignments like in Magento 1's Visual Merchandiser.
In M1, there's a button on the cache page called 'Rebuild Visual Merchandiser Smart Categories'
Where does that function exist in M2? Is it purely automatic? Is it controlled by a cron job? We've been unable to make rule based categories update when product changes are made. This feature's not very valuable if you have to resave the category in order to update the products assigned to it.