Well, being the owner of several carbon wrapped barrels, I say the only advantage is weight and they are not always lighter the steel, depending on the contour. However, newer shooters entering the field (and some older ones like me) like to shoot rifles with brakes and suppressors, you can't screw these things on thin tapered barrels and you need some threading and a bit of shoulder. For the Area 419 brake I use, it requires a shoulder of .750 for 5/8x24 threads. I had one steel barrel like that, a #4, and I didn't like carrying it around. These days, I use Proof pre-fits which are light enough and are ready for a suppressor. Steel barrels typically run about 1/2 the price of carbon wraps and that's "one" of the reasons competitors don't typically use carbon wrapped barrels, they burn out barrels and replace them often, hunters are one-and-done typically with barrel and "burn out".
