There was decent post very long ago about threat philosophy.
And one of friends at time put some satire on fact that when they "pruned" back then, they did it not only with interesting and useful spells for classes as fantasy representatives, but also those which were responsible for resources management during encounters in those immemorial times. And threat was just one of main such ones (which can be learned in sufficient detail and with a certain form of contempt from first link), it was mutual resource of all people in the group together, which demand them to act as solid one. Therefore, what prevents current representatives of "educated" PvE community to include such abilities in their rotation and teach that to rest of "not so educated" ones... it can't be that you really just have nothing left, or can it?