I'd argue (as the article does), that you don't 'really' learn from watching stuff, fast or slow, but from actually working with and doing. This is completely o

I'd argue (as the article does), that you don't 'really' learn from watching stuff, fast or slow, but from actually working with and doing. This is completely obvious in the physical domain. You could take a ten year course on the basketball free throw and watch a billion hours of video on it, but then when you get on the court and actually do it - you're going to shoot pretty much like somebody who's never shot before. And I think the same is true in academic domains. If you're trying to think about something consciously, you're going to do a poor job of it. And the only way to get the unconscious competence is through a bunch of 'doing'. Chess is a great example of this because it's purely mental yet again you're never going to gain any degree of significant competence without playing a lot. Interestingly this even applies after mastery. A master who has played e.g. 1. e4 their entire life and then swaps to 1. d4 isn't going to be playing at the same level as he plays 1. e4 even if watches thousands of hours of videos on it beforehand. That connection you make by doing and interacting with things is just critical.