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You know what's great about my own defensive metric (PCA)...it would automatically get this hidden line drive problem right.  PCA defensive wins aren't perfect either, but because it apportions runs between the pitching and each of the three defensive units (C, IF, OF) before giving runs to the players...without having to "see" the line drives, it already knows exactly what's going on with the pitchers and takes that out of the equation before the defensive analysis begins.
The funny thing is...even after you give the Ms "credit" for allowing a ton of line drives, their pitching still looks fabulous...as does their fielding.  UZR has a ton of problems, but the first and most important is...it just doesn't see the defensive game for what it is...a team sport.