Not specifically about learning, but I wonder how many half-finished projects sit in garages and basements. How many outdoor fire pits are partly built, some guy thinking 'Man I should have just done it in one go.' Desires and whims change on a regular basis for most people, making slow, prolonged progress a challenge for many people.

To be frank, you sound just as hard-lined against this guy's idea as he is hard-lined for the idea.