What would be the point of bringing the WHM if you're self healing and self buffing? The whole point of party-alliance content is division of labor. When you're already resigned towards division of labor, you're better off maximizing roles. If you're not resigned to division of labor, then multi-tasking roles come into consideration. At this point, you need to be event specific because you to ask whether a class can handle multiple roles during the event. If they cannot, then you go back to the original point: maximize the role. If you can, then you use the multi-tasking class if that reduces your numbers. Unfortunately, this condition rarely arises in a manner that favors the existing multi-task classes.