From your post it is clear that you really don’t know a lot about polymer frame pistols.
I am a Veteran. I carried a M16A1 and a M16A2. I used the M16A2 in combat against the AK47. I will tell you, the 7.62x39 isn’t worth much pass 250 yards.
The modern battlefield is much different from WWII. It’s more fluid. A soldier today has to be able to carry much more ammo. When it comes to a firefight, the first side that runs out of ammo looses.
I love steel and wood, but if someone tells you that a Garand or a M14is a much better rifle then what the military uses today, they either don’t know what they are talking about or they are just lying to themselves.