From the last Google Analytics (GA) study on the usefulness of "pivots_block" on 4 recommendation algorithms, we learned that the classical "relevancy" algorithm generated the better results. Therefore, we used the relevancy algorithm on D.O.
If you’ve been using Drupal for any amount of time you’ve probably ran into the problem of needing to go to the access page each time you enable a module to ensure the admin users have permission to make full use of it.