PF,
Couldn't agree more, one must always be very careful opening the overheads, even in a non-emergency. But we are hearing that one is putting others at risk in an emergency, without empirical data to support such comments.
I admit it sounds right and seems to make sense. BUT in a series of recent incidents; AF in YYZ; BA at LHR; BR at SFO; EK at DXB we have seen some 'break' the rule without apparent consequences.
Perhaps if the rule was changed to say a 'small purse or hand bag' from 'under the seat in front' it would reduce the opening of bins, and give passengers the assurance that some of their meds, documents and valuables can be safeguarded.
During a normal disembarkation it isn't getting stuff from the lockers that slows things down its the single door and dawdlers.