Triple digit miles in high school and or triple digit miles in University definitely produce fast times… for a time. Not necessarily the optimum for long term development nor longevity.
I think these guys are doing great off of what they are doing and there is no need to change to super high mileage for quicker results during university years. They are running solid times and have proven talent. Stanford is a place where most go to school to go to school. Finding that balance between athletics, academics and being a young person having some fun is hard at any higher learning institution and even harder at the more selective higher learning institutions.
There isn’t many athletes that I can think of who did big miles during high school, carried that through University and were able to excel as a professional for a long career. In fact, under the triple digit miles regime some of those “generational talents” fall apart during high school or during University or never pan out as a pro and people ride on them to the point they quit the sport because of injuring or not living up to lofty expectations other put on them.
Nothing wrong with 70 -85 miles per week during University and getting it done in the classroom and on the track then transitioning to the pros and giving it a few years to actively progress.
Thinking long term is in the best interest of the athlete. Not so often headed by coaches that want results and bonuses at University and not so often headed by coaches and parents during high school that think their athlete or kid is the next phenom.
Case in point is Grant Fisher. He had great results through high school and college because he was surrounded by people who understood talent and long term development. Could he have done even more during those years - yes. How did he do after one year of higher mileage as a pro and how is he doing now - he is a world beater and has many more years ahead at that level.