I got about ~40% faster solving sudoku after casually watching an hour of YouTube (turns out sudoku YouTube is a thing) and now I’m wondering how many other things in life are shaped like this.

You would not guess that level of improvement trivially available for someone who had been on math team and casually solved a few hundred sudoku puzzles over the years, right?

I'm wondering in particular how much routine cognitive work, like mortgage underwriting or radiology diagnosis or what have you, is "Watch an expert narrate this process and show you a few things from their toolkit which you'll apply 15 times a day for forever" improvable.