Why is OS-X imposing a profile conversion of all greyscale images to "Generic Gray Gamma Profile 2.2"?

Why oh why? This seems to apply to both tagged images (embedded ICC profile) and untagged images. This is making a mess of anyone using a B&W RIP with image space to printer space gamut transformations managed either via tone curves or a kTRC tag within an ICC profile (created by fantastic little utilities such as QTR Create ICC). Of course it also screws up the printing of step wedges for printer response evaluation/profiling (just like the colour world has been thrown a curve ball by the inability to print untagged targets and having to resort to special utilities to do such a basic task).