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You've stated its easy to verify that advanced stats can be used to predict future performance. I contend that 1) those advanced stats based on performance cannot be used to predict future performance, and 2) the sample size of Statcast simulations too small to be useful. So if you have some tests that show otherwise for either 1) or 2) that are conclusive and can be duplicated by others please post them.
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I don't know where you're getting your assertion for #2. One of the reasons analysts like Statcast metrics is the relative speed with which they become statistically relevant. A max EV, for instance, requires a sample of 1. Avg EV and EV90 take 50-60 BIP. Launch angle takes a while to settle down, but you can usually discern a lot from 30 BIP. Running speed is instantly predictive. Bat speed requires 3-10 swings.
These are facts you can google yourself if you want to question them. As to how they function in-game? I don't know! But, that's not relevant to the topic.
All I'm saying is since the game has accepted that advanced stats are important, why not incorporate "front office staff" that perform the role of analyst? Whether or not they actually "use" the advanced stats, it would be flavorful to have a staffer tell me "this is a classic second hitter with an OBP-over-power profile."
(PS, I'm available to write the lines and help develop the concept. I'm a former FanGraphs, NBC, MLBTR staffer. Lauerman knows how to get in touch with me.)