I'd have loved a huge Eddie Harris set, too! Probably 15ish?
Also Roland Kirk, of course! Would have been a great companion to the Mercury box, but having all the 32Jazz discs and some more on Rhino is cool as well!
Unlike Trane/Mingus/Ornette, not everything that the MJQ did for Atlantic can be considered "essential", so a box for just the earlier stuff would have been OK by me. Same is true for Eddie Harris of course, he did a lot of junk on Atlantic in the 70's. Not everything Joel Dorn touched in the 70's turned into musical gold, though I admired him in a lot of ways. Anything Rahsaan did is worth hearing. I'm sure sales projections were a consideration. We could go on and on - Mose Allison, Yusef Lateef, Les McCann, no doubt others I'm not thinking of. If they were going to draw a line, they drew it in a sensible place.
I agree, not everyone who recorded for Atlantic made consistently good to great music that would justify the box treatment. In my opinion most of the stuff Eddie Harris recorded for the label was indeed junk - and that's putting it mildly...