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Is this any less the case for sabremetricians, as well?
It's always felt to me that the rush to the unified theory of WAR has overlooked the inherent flaws in current defense statistics. It's like taking two glasses of 'clean' water (hitting and baserunning)...mixing in one 'dirty' glass (defense)...and calling it all clean.
Could it be the case that the lack of 'magic numbers' for fielders is because the skill doesn't relate to counting...or because we simply haven't developed the right formulae yet...or both? Will access to full batted ball data solve the problem?