Military specs are very rigid and the military does not purchase, make, or allow to be used any other type of ammunition that falls outside of the specifications of a very few (very few) configurations of approved ammo.
It's like that for all of their firearms. They do not allow every configuration of crap or even good ammo to be fed into their weapons, only very specific approved ammo is allowed.
My impression is the 1911 was primarily designed for the military and works best with the military type of ammunition intended for it.
When 1911s were first made and some time after autos typically used only jacketed ball ammo and many did not function well with other kinds of ammunition. They were even picky about differnent brands of ammo of the same type. In the past I remember reading all sorts of review articles on autoloaders that supported that line of thinking.
Today reliability with a wide variety of ammo is the standard for autoloaders and expected.
I think one of the main reasons revolvers continued to be prefered for a long time is because until autoloaders were designed to be extremely reliable the revolver was what you can depend on for trouble free operation and with a wide variety of ammunition at that.