I guess it depends on the audience and the intent of the tutorial. Other posts on his blog include things like "let's have a look into the Objective-C runtime"

I guess it depends on the audience and the intent of the tutorial. Other posts on his blog include things like "let's have a look into the Objective-C runtime" and "let's unwind the stack on multiple threads to get a nice crash report", so I assume he's writing for people that understand enough to know that a final implementation needs to be robust and reliable.