Pugilistic Animus
yes, according to those prior excerpts; however shock wvae pattern at those speeds are remarkably complex, and also due to very high altitudes the effect of 'slip' a Reynold's number effect-in the manner in which the boundary layer 'slips' relative to the wing this also changes lift characteristics and the overall L/D ratio ,lift-slope curve, pitching moments coefficient, etc...
I have never heard of "slip" in this context. I understand vaguely what Reynold's numbers mean in that it's a function of scale.
in short the exact plan form configuration chosen by the designers is contingent upon numerous factors,...but lowered total drag may simply not be that important on a particular design compared with other aspects of the design...
Which would be?