As an engineer who flies every month. When they ask for electronics to be turned off, I mark my page and close the cover. I have a Sony, so there is no pesky radio and I know the eink is not held in place by electric signals.
However, I never point any of this out to the flight attendants. I value my safety, and as a result I do not want any flight attendants thinking or analyzing electronic designs. They are simply not qualified. Just like they don't know my watch is powered by an electric motor. The engineering reasons are not the point. They need simple rules, and they need it to look like you are following them. Some electronics are bad, and problems have the most significance near to the ground. We have a rule to mitigate that risk. The rule can't be "only bad devices must be turned off", because then we'd need someone to test devices, and the airlines would need a 500 page list. That's a bad rule. The current rule is much better.
Please turn off your toys, quickly, so you don't make my plane late.
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