Mr. Troy Grady of https://troygrady.com/ should receive a Ph.D. for his study of guitar picking. He sells instructional videos on just guitar picking, but they're so scientifically analyzed and debunk so many bad guitar practices, that it is Ph.D. level research.
And, the way he's doing it is simply actually filming top players playing, then analyzing how they really use their pick during playing, then breaking it down into micro tiny pieces with crazy amounts of information, such that you can't help but understand it and apply it.