Possibly, I might be. (Hence, post processing magic, regarding white points and clipping.) Wasn't the final color space transform handled by the driver? I don't recall having to do any manual color transforms to present a linear RGB render target correctly on an sRGB display, at least. Haven't had the chance yet to experiment with high gamut displays, unfortunately, so I might be missing something.

Fortunately I mostly just deal with embedded graphics that do their technically incorrect blending math in unmanaged sRGB/display space. (: