It is a feeble attempt to defend an otherwise undefended fleet from buffs. But yes, it is very handy for finding a cv when you really are not looking down.
wrongway
The irony of that statement is that Fighters feel like they get hit harder and more often than flights of bombers. If I'm in bombers and ack starts goin off, I shrug, if I'm in a fighter, I take evasive action.