But you're forgetting the one big advantage of Combat Smurf over bags - the go-into-town-for-lunch rule. And I fucking hate khakis, CNT, P/W, wash, whatever. I wear them when held at gunpoint, never otherwise.
The current raincoat and black windbreaker designs suck. They're shapeless and look like shit. That's why no one wears them if they have any other choice. If they at least tried to make them look a little more tailored and military - say, if we went back to the old-school khaki jacket, and a raincoat cut more like an overcoat, with a belt or something - it might get worn more often.
Incidentally, the old-school khaki jacket was never de-authorized. So it's still kosher per the uniform regs; you just may have a hard time finding one. eBay or a thrift shop's about the only way. If you gotta wear khakis, need a jacket, and it's too warm for the leather and you're surrounded by Shoes who will fuss about wearing the lightweight Nomex, it's a better alternative than the black Hefty bag.