One of the big benefits of alowing the plugs to sit on the surface is that they encourage beneficial bacteria growth and micro-organisms. I do not know it this is reduced by breaking down the plugs machanicall y with a power rake.
I have always been under the training that fall is the best time. Pre-emergents do enough to the roots so why aerate and stress the roots out any further? But I did get my Turf Magazine in and the cover article was about spring Aerations, maybe I'll actually read it instead of just looking at the pictures
Why do people not respect us as they do other tradesmen? Because every Tom, Dick, and Harry doesn't think he can be a plumber or electrician!