[Karunamon]

Admittedly yes, but I think the average person would have a different reaction to "Hey, someone's electronics are actually causing an actual problem, shut down everything" rather than ignored much like the safety briefing that any air traveler who has flown more than twice can recite from memory.

Why? Because anyone who has flown and forgot to put their phone in airplane mode and didn't experience a firey death can attest, the usual warnings lack both urgency and a factual connection to reality. Having them announce "there is a problem due to interference" solves both of these.