Here in Holland, we have a dynamic rating system that I tend to think is very good, and that combines the following three features:
(1) For any given match, the effects on players’ dynamic ratings are determined ONLY by which player wins the match; scoreline is irrelevant.
(2) However, the strength of the opposition in any given match IS taken into account. Basically, the extent to which your dynamic improves as a result of a match win depends upon the dynamic rating held by your opponent.
This seems like a sensible system to me. I wonder why USTA doesn't do things this way.