You may be right, and I'm no expert in this, but that is not a large part of the reason. I think it was a well designed piece of software by itself - and the n

You may be right, and I'm no expert in this, but that is not a large part of the reason. I think it was a well designed piece of software by itself - and the node based programming model lended itself well to interface design. Right now, it is more a case of adoption. For example, Facebook is investing a lot of resources in creating stuff like Origami for Quartz Composer. I'd be willing to bet that if Facebook puts even a small part of that resources into supporting something like Blender, then the fundamental differences at the OS level should'nt matter.