Thanks for sharing--that's helpful!

Is there any literature that exhaustively covers the people in the immediate wake of Plato, aka the stoics, cynics, skeptics, epicureans, and peripatetics/aristotelians?

There is actually a big collaberation project between 6 or so scholars on youtube right now covering the topic. Check out Dr. Justin Sledge (Esoterica), Dr. Dan Atrell (The Modern Hermeticist), Dr. Angela Puca (Angela's Symposium), or Philop Holm (Let's Talk Religion) in particular

I’m aware of this project! But they seem to be covering proper Neoplatonism starting with Plotinus and not any of the Plato “disputers” before that era

Not exactly what you are asking for but https://www.amazon.com/Middle-Platonists-B-C-D-220/dp/0801483166

Do you mean early "neo"-platonists who derived much of their thought from the teachings of plato but differed in particular ways (much like Plotinus would later)? Or do you mean thinkers who wrote about alternatives to platonic metaphysics in-between Plato and Plotinus?

I mean quite literally the subgroups I listed in the original comment, so I suppose more the latter than the former but idk if they fall neatly into either group. iirc either the stoics or the skeptics also had control of the academy for a while. If you also have works on the former of the two groups you mentioned though I’d be interested in that too

Interesting they leave out Iamblichus and Damascius.

Has anything neo- ever been good? (not asking rhetorically)

Well, neoplatonism is a direct continuation of Plato's philosophy and refers to new ideas which arose in it's tradition. The term itself was coined only in the 19th century.

But does it add to it. For example nanalytical (neo) marxism promises a lot but I don’t know what its achievements are