I find it funny how you are running into a circular argument. If we have a lawn in the wild where the builder stripped away the top soil leaving us with hard pan clay, a little construction sand to level the lawn and what ever top soil available on the roots of the sod, then we should just live with it? If the turf develops a disease that is controlled with biologicals we should not use it because ultimately the pro-botic will not thrive in the long run? We should not try to use aeration and compost to improve the structure of the top 3 inches of the top soil? What are you trying to say exactly?