OSX is setup to be transparent to novice users. That doesn't mean it cannot be setup to be used with a keyboard. Just that the default, which for 99% of users doesn't allow they keyboard to interfere with a novice user.
I can get OSX to do quite literally everything from the keyboard, I'm not sure how one can argue it isn't keyboard accessible when it is trivial to turn on. And being the 1% of the population that cares about it, power users shouldn't be afraid of learning how to turn it on.
Hopefully this didn't come across as harsh, but I just get annoyed at people that equate OSX = mouse only interface. When you can tell the whole idea behind the interface is to make default things simple to use with a single mouse button and make the rest possible. Despite what we think the actual idea of more than one mouse button is about as foreign as trying to understand Russian to an Englishman. Its more cognitive load than most care about.