Yes, I do. Backup beepers tend to blend in with other noise while our horns tend to stand out. I also believe that it keeps us aware during the back rather than relying upon the beepers.
Oh please, give me a break.
The sound could be whatever audible sound they chose.
It doesn't have to be a "beep" as you suggest, although that sound is pretty much universal to mean something is backing up.
I don't see what enviroment a backing beeper would "blend in".
Having the additional physical motion of "beeping" the horn is an added distraction from such things as checking mirrors and the monitor all the while turning the steering wheel with one hand instead of two.
Aware during backing, not sure what you mean?
Never heard somebody say, "I didn't realize I was in reverse".
That arguement is ludicris.
It's about the money, it's always about the money.