so programming is your hobby, have some fun while researching and solving some problem using some random solution found on the internet which might work or not
It may be a "hobby" but I've been doing it for 12 years, made money off of it, and would argue that I probably know more (theoretical and practical) than your average bachelor's grad in CS.
And I don't know where this "random info on the internet" came from. My knowledge comes from algorithm textbooks or papers from university websites.
there are few more levels of knowledge and experience to achieve in order to improve overall quality of your work and that's the point of this article,
you can ALWAYS achieve your target in a better way
You still seem to be advancing your original point that hobby programming or side projects is an inferior pursuit relative to professional programming. McAfee was a shareware project, eBay was written by Pierre in a matter of days. I've seen many projects that were of much higher quality than many professional enterprise and startup projects.
professional coding is about something different