Only the new ones. I have the previous model (Quiet Comfort 25), and they're really nice and dumb. Only a 3.5 jack and a battery compartment, no other interfaces.
It's a good reminder for those "I prefer BT to wired headphones"
No, it's not. BT used with the standard protocols is fine. It's a reminder not to install stupid "apps" when there's absolutely no need for them.