You could say the same for running 100 30 yd. sprints at full effort. Not a bad thing at all.
The jury is still out regarding how effective running 2 miles at a very slow pace is, especially in 6man? I think the science supports sprinting over LSD. But, If a kid wanted to do it over the summer I sure wouldn't tell him no. There are as many different training styles, I suppose, as there are coaches/trainers.