The same behaviour can be observed when using the ‘Update Membership’ (manual update) button in the Admin Console.
This option will also trigger a full update on your collection.
Except if you are doing OSD, then you kind of have to.
Except, if you’re using unknown computer support, then you don’t.
This will then completely reevaluate the collection memberships.
The following pretty picture (powered by MSPaint) is supposed to show you an easy collection design. If I say ‘Update Membership’ on ‘All Systems’ then the collection evaluation (Coll Eval) process will kick in and check for any new members in All Systems. Coll Eval will now check ALL the collections that are limited by All Systems if these collections are going to be affected by this new member.
System Center Configuration Manager 2012 brought the possibility for a collection to refresh its members using Incremental Update.