The other issue is trying to rate a spinnaker boat along side any non-spnnaker boat. Sure you can do it, but what if then in the race in question, the weather turns out to be 100% spinnaker work, or no spinnaker at all type weather.

I'm talking about distance racing, not triangles. But even with triangles, (or windward-leeward) the winds can shift during the race and that can change things quite a bit as far as how much spinnaker time you sail.