- the invitation to "go away" if you confuse ESR's definition of hacking with the definition the general public uses.
- the suggestion that hacking is something for those with above-average talent for programming. Perhaps you should keep reading if you count yourself as above average?
- the proposal of a system for learning how to hack that is apparently so robust that it is self-evident. No examples need be brought in to support this proposal, nor does it need to defend itself from alternative systems.
- it is suggested that hacking is the only way for software architects to train their design sense. Ok, sure.
The biggest problem I have is that the vast majority of ESR's suggestions are really good ones. I agree with plenty of things he's saying. I just wish, like many open source products, it was packaged in a more digestible fashion, so I could recommend it to less experienced friends.