Agreed - however if phone, wallet and passports can fit in pockets at takeoff and landing and thus no additional hazard to other evacuating pax, it would sure make things simpler on the ground if in, for example, a situation where bags might not be retrievable for a few days etc.

I have started doing this lately myself - think it's imminently sensible. If everyone did it, maybe less people would be stupidly scrabbling for hand luggage.....