Stuff+/PitchingBot/tjStuff+, what exactly are all of these pitch models nowadays? Eli takes a moment to break down (on a high level) the development of a stuff model, what they try to accomplish, and some of the considerations of each, with some help from a running apple tree analogy. Some apple farmer somewhere is going to hear this and be inspired to create the original juicy+.
Further learning:
Thomas Nestico's fully online and available tjStuff+ model: https://github.com/tnestico/tjstuff_plus