PieterPan- Only one RA signals the throttles to close in Retard. I'm not sure which. However, failure modes of indicators are designed not to fail at critical readings. RA is a digital system with self confidence tests.
My own feeling about AMS is nothing untoward. It is a very busy place, along with most big terminals. My experience has been nothing unusual. They vectored the flight around. I get to lots of places that can give tight turn ons. It is up to the pilot to configure and use his experience to either make it work or reject it.