The problem is people get hooked into Casey's misanthropic philosophies and take his rants as gospel, and wind up believing Handmade Hero represents the way game development should be done, that libraries and frameworks can't be trusted, that C++ shouldn't be used at all, and you should implement as much from scratch as possible, when none of that is true.
But the results of living in a contrived environment is that there are no guarantees that at the end you will understand 'normal' environments better or just be over-trained on your fictitious one.
