As you said, let old content stay old, myself I like that Sky has not changed much, people who never got to do it when it was the thing to do can be shown the old ways, and there are good rewards still which give incentive to do these NMs. Shorter time would be nice but it takes away from the old endgame we still have which is fading fast, sometimes you like to keep things the same, if for nothing more than memorys.