Thanks for the pointers! Not original commenter, but familiar with the literature a bit. One thing that confused me reading your article is that you are criticizing one, fairly narrow way Ericsson has defined deliberate practice.

But in Hambrick, Campitelli, and Macnamara's volume on expertise, they do a good job showing that he has not been consistent with definitions (e.g. 3 definitions: must have, sometimes must have, doesn't require a teacher).

Not a problem for your post, but I was pretty confused about what you were calling deliberate practice until reading this response.