Or you can go out and buy the AR-15 rifle... If you are deep in the woods, you can "Play with your pistol a little" with the help of your rifle. Just come out of the woods with the rifle being a rifle, and the pistol being a pistol.
I see all your points about the disadvantages for everyday use or a duty tactical weapon for law enforcement. Its definitely a weapon that is for a specialized situation such as a Level III personal body guard. I believe it would be difficult getting in and out of an armored limo/suv with a full size M4 AR-15. Where an AR pistol may foot the bill for a lot of firepower in a compact package, plus its definitely better choice over an UZI or MP5. I could conceal it with a single point sling along my side wearing my leather jacket... You have to admit it would work for that reason.