To frankly honest, I don’t think DP cares if you do the content: You can legitimately accept task adds for the missions, and ride Overseers the remainder of the way. While that approach is slower than doing all the progression, it’s entirely possible. Going back few years to an interview DP did with some website (google the source yourself), one of the hardest part of designing a level change expansion was micromanaging the experience level curve. The current rumor is that DP is trying to reduce the amount developers working on EQ. And that is where my tinfoil hat theory fits in. I believe the primary purpose of the progression + overseers approach to leveling is just way to reduce amount time spent on that portion of development. Since bonus experience on progression mission/task is one time deal, and Overseers is locked by time, they don’t have to fiddle much with this approach.