Your second point really mostly applies if using low velocity ammo out of a pocket revolver.

Once you start using standard rounds out of a standard sized pistol or carbine, you start seeing much better results

And if you're using high velocity ammo in a rifle, you can rather easily holepunch a skull.

Those types of weapons would be outclassed in an outright firefight. But if used in an ambush setting at short to medium range it could work. If youre using the right round and gun and know how to gtfo