All true, but the places where say a dozen zones economically viable at the same location are few and far between in the Williston. And just a few are viable for multi-mile laterals.
Check out the Beaver Lodge Field, and the Nesson Anticline.
How far are you going in the Permian? The longest laterals I worked here were over in the SE edge of the Elm Coulee Field, with a 2 1/2 section spacing, over by the MonDak Field. We broke all the company depth records, lateral length, etc.
It has been 15 years, but we had a lot of trouble with the ends, where steering became an issue (tough to slide without stalling the mud motor at that extension)--note, too, the Bakken is bound by source rock shales, but the target isn't shale, it is a mixture of dolomite, siltstone, very fine sand, and limestone.
Note, too, that there have been technological advancements since then, but they were in either their infancy or not available then.