I use both where choosing what I believe is appropriate for particular case.

Frankly I do not give rat's ass about what "People have written extensively". From what I read most of it sounds like spoken by politician: look Jimmy, someone can do a bad thing with it. Well fuckin don't do a bad thing.

So much over very simple and primitive thing: John HAS a key vs dog IS an animal. Both are valid and proper.

>"you haven't mounted any defense"

Why would I bother. It does not need a defense. It is like do not use Java because it encourages FactoryFactoryFactory, 20 level of abstraction etc. Well it does not. Architecture astronauts do it and I am not one of those