Even being a true UNIX, I would also be reluctant to include Apple market share in with Linux/BSD. particularly on the desktop.
In the end, it's all up to people's opinions though. It can be argued all you want, I'll probably not accept OSX as a "Desktop UNIX" unless I get much smarter (or much stupider.)
But when OSX makes up 8% of market share, and that number doesn't change when you remove or add all of the BSD/Darwin users it's simply not accurate to say, "UNIX makes up 8% of the desktop market." It's arguably correct, but it's still not right.
Just because 9/10 dentists recommend using a certain type of toothbrush it doesn't mean that the other one recommends eating rocks.
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