Originally Posted by rickair7777

True for many pax, most especially super-frequent flyers and crew. But new, infrequent or nervous flyers do appreciate some re-assurance, even if it's nothing more substantial than someone who sounds like they know what they're doing. They may not care much about what you said, but some folks do care that you said it. Marketing surveys bear this out.

And I'd bet that some of the folks who tune it out would notice if it didn't happen and wonder why. They don't care about engine noise either, but they'd notice if it stopped.