Proprietary prohibits me from the same or there's just no good code? :P The point is why my (in example) good code should serve other people, companies which don't serve me?No the GPL prohibits me from using the code as I see fit if it is not my own. I don't have this issue with PD. Good code is good code and there is no sane reason why everybody shouldn't benefit from it.
However, some other people replied before and I probably know what you meant.
They just advertise Apples products in my opinion. Title says a lot and like someone mentioned previous OS X could be just a mess and that's why current release seems to be faster. Real world benchmarks would show the truth ; DBut, IMHO, the question about "if and how" this site should review deeply proprietary and locked-in products (like EVERY Apple product is), it's not so trivial, and i don't see any Michael reply about this topic.