Why are not all scale degrees that are borrowed from the parallel minor key indicated as md in the analysis?
In three cases (bIII, bVI and bVII7) it is the root that is being borrowed from the parallel minor scale. To prevent confusion, we have to indicate this in some way. In the key of C-major, using VImd in fact suggests something like Am7b5, but that is not a scale degree belonging to C-minor. We mean Abmaj7, and calling that bVI excludes this mistake. With the remaining borrowed scale degrees (IImd, IVmd) the root is left untouched, and the md-indication works well. With V7b9, no md-indication is required, since the moll-dur tone (b9) lies in the upper structure of the chord. Of course this is all a matter of agreements, which you can or cannot adopt.
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