This is a very good question that warrants further discussion. I think you could spend a whole seminar discussing this issue (two day seminar).
Many of today’s top sprinters do not have a heavy emphasis on weightlifting when compared to someone like Ben Johnson or Maurice Greene for that matter (Doc Kreis - when he was still the strength coach at UCLA - told me that he saw Mo doing relatively easy full squats - butt rock bottom - with 405lbs for reps). Why is that?
Before I go on with my thoughts, I would be curious to read what other think about this issue.