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We're getting to that point where we desperately need a better defensive metric publically available. The biggest problem with UZR is that it doesn't filter human bias. The whole point stat based analysis is to remove human bias.
I like statcast a lot, but its also difficult to credit fielders for good positioning. Its much more difficult to measure good fielding than it is for offense. You're relegated to scouting the player yourself or using educated guesses based on the numbers and scouting reports.