There may indeed be an incremental expectation of privacy in not audibly stating your name at a public checkpoint. For example: you might be a celebrity traveling from DTW to DAL and not be recognizable, but you have a distinct name that would be easily recognized. Not pronouncing you name when it is clearly written on the boarding pass will avoid someone else standing in line from hearing that name and calling the Detroit Free Press, and from there finding out you live in a mansion.

This is over and above announcing to local thieves hanging about name, dates and destinations and durations of trips, making your house easy pickings. That's why my luggage addresses are business addresses. After all, not everyone hanging around a check point is as honest as the TSOs.