This makes it a bit harder to use or test darwin because you have to set up your whole build toolchain... it might be to make creating hackintosh patches harder

This makes it a bit harder to use or test darwin because you have to set up your whole build toolchain... it might be to make creating hackintosh patches harder, but I imagine it was just a standard corporate situation where the resources required to keep churning out these builds was higher than the demand for them.