Interesting discussion. Whilst we all might have views on the evidence presented to date whilst there is a theoretical risk should we not all obey the requests of the airline we are travelling with? During my cabin crew days we used to confiscate alcohol that passengers were drinking that wasn’t supplied by us for ‘safety & legal reasons’. I don’t see why that can’t be extended to ‘phones. I once had a phone pinging in an overhead locker that was a pain in the a*** in business class. It took a lot of polite asking to get the owner to dig it out and turn it off completely.
As for petrol forecourts, well when I managed them many years ago I used to walk across the forecourt with a fag in my hand when the weather conditions were suitable, ie not when it is warm and you can see the vapours floating around. However I still boll***** the punters if they did the same!
I suppose we should all set an example and obey our hosts requests really.