It is a clear and definite response to the SS input
- precisely. It does, however, hide from a crew that extra cue that the speed is reducing when it should not be. In 'the old days', you would need to keep applying back stick until you ran out of it, and trim the THS to restore elevator margin. This system allows the concierge to blythely point the aeroplane at the stars and not worry about a thing while the speed heads rapidly south - without any cues.
In order to 'dumb down' the art of flying an aeroplane the manufacturers have created large blinkers for crew to wear.