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There are pitchers that absolutely need that net. There are also the rare Cy Youngs who can take the ball 35+ times a year from age 24 through 42 going 8 or 9 more often than not. How do you find the ones that can if you treat them all the same?
Do you lose more by never riding the guys who could be horses or by shortening careers of guys who can't? You're technically shortening career of both in that choice.