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The reason military brass has crimped in primers is a functional issue. If they were not crimped in, then an extra-high pressure situation in a machine gun may expand the case head and primer pocket enough that the primer would fall out when the case was ejected jamming the full auto mechanics rendering the weapon inoperative.
It's less a problem with semiauto and bolt action service rifles, but it can and has happened.
Ever shoot a round in your rifle after debris got into the barrel and had the primer fall out of a case as you ejected it?
Arsenal match ammo used to have crimped in primers but that was stopped in the 1930's.
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