I actually agree on including lv60+ levequests for DoW/DoM. It's not like designing a dungeon or a boss with complex mechanics. Even if grinding duties is the fastest way to level I get tired of that and would really like the option to do levequests if I feel like it.
Besides I actually enjoyed doing leve parties. One thing I liked about 1.X was levequest 3+ stars difficulty options actually making a difference. I'll always support any addition that adds more to do in the open world instead of instances.

On a side note I wish it was possible to "freeze" a leve when the duty popped. But that's probably way more complicated to change.