Dealing with the F.A.A. on this topic is like arguing with a stubborn teenager. The agency has no proof that electronic devices can harm a plane’s avionics, but it still perpetuates such claims, spreading irrational fear among millions of fliers.
I think this may be more about trying to curb rude behavior, like having loud conversations on the phone overheard by ~150 passengers…times ~150.
I’ve never been really bothered by these rules because I don’t find them to be that inconvenient.