goosey, it is an interesting debate. a sprinter coach mate of mine gets great results with very little training; very high intensity but just a few reps of running and a few power feats a couple times per week.
while it is not weight training, their leg power improves dramatically, a sure way to know hat enough stimulus has been provided.
I reckon there are many ways to skin a cat, but key will always be doing enough to stimulate power and then back off for recovery. this differs from individual to individual, and an athlete also has to enjoy the exercise they choose.