He wrote things like
017 2016-03-31 11 kyu Basics: 10A
018 2016-04-01 12 kyu Basics: 10B
019 2016-04-02 12 kyu Basics: 10C
020 2016-04-03 11 kyu Basics: 11A
021 2016-04-04 11 kyu Basics: 11B
022 2016-04-05 11 kyu Basics: 11C
I don’t doubt that he listened to these lectures. However, each lecture comes with a problem set. I did these problem sets when they were already easy for me and I could not have mastered one set per day. So, I doubt that he shared my definition of doing things “properly”.
As far as your other remarks are concerned: In my life, I have invested time and energy in things where my aptitude is very competitve, and things where my aptitude is at the low end of the bell curve. It is certainly important to identify your areas of strength and build your career and hobbies around it, but absolutely neglecting your weaknesses will damage your life as well (for example, doing a sport badly might still be crucial for your health and mobility, doing crosswords badly might make the crucial difference for your mental ability in old age, making awkward conversation might still lead to friendship if tried often enough), and my most rewarding successes have been accomplishments that were a breeze for all my friends (for example, swimming 15 minutes without break in elementary school after having learned to swim years before, having the regular swimming lessons at school and doing lots of extra training with my parents).