They Don't Make Pitch Models Like They Used To by Davy Andrews
The feedback loops for both pitching and hitting development are so short now with all of the tech and data we have available. It's crazy how quickly that changes the game.
A really interesting read here on how that's impacted how useful pitch models are.
If you’re a pitcher with a Stuff+ grade of 110 in 2025, your stuff is almost certainly nastier than a pitcher who had a Stuff+ grade of 110 in 2020. However, the probability that your excellent stuff actually turns into excellent results is significantly lower.