You have been overly dismissive of Casey's work. HH is a treasure, and if you consider that he explained the how and the why of every single line of code, on stream, without cutting any corner, your consideration about the time spent become meaningless. There are people interested in copy-pasting and glueing together pre-baked parts to ship something, and there are people interested in developing a deep understanding of how things work, to be able to break and reassemble new toys with complete freedom. There are people that value the product and people that value the process. Casey's work is targeted at the second group, and I thank him immensely for what he does, even if some of his rants are pretty ignorant (usually when talking about things he knows nothing about). Take the good parts. There are many.