Let the arguments commence
> Phones, tablets, ebook readers, MP3 players - ... allowed to stay on ...[except] “bulky” laptops, because of their size and concerns they might get in the way during an emergency situation
"I'm sorry sir/madam, you'll have to put your tablet away, it's too bulky and might cause injury in an emergency."
"But that guy over there has a much bigger device (guy turns to the camera, smiles and gets a "ting" star added to his upper incisor) and you've let him keep it."
And so the pre-flight fights start. With everyone else using their flight-approved devices to video the jerk¹ in question. Will we need the iphone equivalent of case-checking frames: small enough to fit in and you can keep it on. Too big or overweight and away it goes.
While I applaud the sudden and uncharacteristic attack of common sense, I can see yet more rows caused before take off, when everybody else just wants the flight to start.
[1] deliberately left ambiguous as to whether the jerk is the attendant or the passenger.