I'll see if I can dig up more info for or against later when I have some time, but for now I think the explanation is similar to one I've offered in related threads. Specifically: multiple weak shocks is better than one strong one. First a little review: oblique shocks are weaker than normal (i.e., 90 degrees relative to the flow) shocks. So, from a trans/supersonic perspective, worst case would be a blunt nose (cylinder) which would create a big, strong normal shock. Better would be a cone that would create a single oblique shock. Bestest (as my 4 year old daughter would say) would be a curving surface (not just *any* curving surface, mind you, but one that was designed to minimize shock strength - i.e., von Karman) that creates multiple weak oblique shocks. Witness the different types of jet inlets: Internal compression using a single normal shock is worst. External compression using an external oblique shock is better. And mixed compression using a series of oblique shock waves is bestest.