After mucking about on the test server, someone answer me why anyone would waste a whole minute spamming spells to build up immunobreak, just to land one debuff, is worth wasting your time on?

First impressions for me showing that no one will still bring a RDM to any event, since by the time they land something that used to be either immune or extremely resistant, the mob will already be dead. Better off just having another DD as people already been doing in Voidwatch.