I've been following this debacle carefully as both a pilot and a Note7 owner. In the article below, a Samsung rep suggested "smuggling" the device back in a sock...
Horror Stories From the Samsung Galaxy Note 7 Flight Ban
Obviously, this report could be a load of old smelly socks, but the article itself highlights the inevitable confusion at airports.
I don't believe there has been any incidents with a powered down device of course, but it's a cleaner message to just ban them from flying obviously.
I have bought many Samsung phones over the years, especially the Note series, and would be prepared to overlook this clearly unintentional and unfortunate failing in quality control/testing, but the way Samsung have conducted themselves could well be the sword they fall on. 4 weeks on, 6 calls to Samsung, and still no idea how I will be able to replace my device (for example).