Very interesting reading, thanks for that. I've faced several of those pushers that you've mentioned, one of those guys was in his late 50's, retired, and yet running around the court like a madman!! The other must be in his 60's, and brought his younger girlfriend to watch our match!
I almost always have more fun in those matches than when I play with the baseline power players where we just match each others power to see who can hit harder.
I think you are right that pushers who slice and lob can't pass higher than a 4.0. A person rated 4.5 and above will just have too many weapons and have enough consistency for the pusher to have any effectiveness