1
Is one of the big problems with GB/FN/LD metrics and making a lot of soup off that Oyster.
When a bloop hit to the outfield grass in front of the OF is called a LD, but a smashed hit that barely bounces on the dirt, but had no chance of getting touched is called a GB it really tempers how excited one can get with the metrics that use those rates.
Similar concerns abound with UZR and how a scorer scores where a catch or hit actually went and how hard it was hit.
These metrics are of course not useless, but things like this remind me to keep a healthy amount of salt around when I read about the / look atthem.