[callumjones]

I'm not sure what the problem is here, especially given this is a consumer OS targeted at the masses but still its underpinnings means it can scale out to the niche when required.

And this is exactly the case with X11, it doesn't exist on OS X 10.8 by default but luckily the OS tells me Apple have an open source version ready for me to download when I need it.

This seems like the best of both worlds, an average computer user isn't bogged down by niche software shipped with their computer and the developer can easily hop onto MacForge and extend the functionality of their computer. Heck you can even compile things since it's just BSD/Mach underneath.