IMO - Air2's are a tax on the gullible. So you want to eliminate one stupid hose? Big deal... now if your inflator starts to freeflow, you've just disconnected part of your life support system. I bet you wish you had that hose when the crap hits the fan!
If you feel they're more "streamlined" (and I don't, considering I now have a big clunky regulator on the end of my inflator hose) why don't you just go all out, eliminate all your hoses and dive an ammo belt stuffed with spare airs? Complete redundancy!
I get an even larger chuckle out of divers who like the "streamlined" feel of an Air2, and then when they get called on how it's unsafe, point out that they also dive a Pony Bottle - therefore completely ruining any streamlining that an Air2 may offer.