I get what you're saying, but I'd argue that win percentage and ROI are the most important ways to tell if a trainer is effective at a "move". You could have a trainer who improves horses but doesn't have the stock to win, or you could have a trainer that wins at 35% on the drop but the average horse pays $4.40. While it would be nice to give credit to the (seemingly) skilled trainer who doesn't win, it doesn't really do you any good financially to do so, at least not in broad strokes.
Now granted, those 8% moves sometimes turn into 25% moves when you combine them with two OTHER moves, but I'm not sure how you would tell that from a rating. It's more something you have to dig (or program) to find.
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