I think Tinman might say something related to this topic as well. Reading Tinman's blogs, I think (and I don't want to speak for Tinman though) he'd say H.S. kids race so much that the weekly XC race is the VO2 Max stimulus. So, there's no need to use a workout on VO2 Max. I think Tinman would suggest the CV pace is a much better workout.
On the other hand, if you read Scott Christensen's material, he's all about the VO2 Max workout on a 14 Day Micro-Cycle (versus weekly micro-cycle).
I really appreciate all that Magness does, but as a high school coach, his workouts are way too complicated for multiple people. Coaching high school is often like herding cats with a lot of different paces & efforts going on. Something much simpler needs to be used (with your team of 30+ kids or 80+ kids).
Often, too, with Magness, he does a wonderful job questioning current understanding of exercise physiology, but often leaves you hanging without a solution. I know that may be where we are (as coaches & runners), but what is the next step in training?