Jonathan
I have witnessed controllers in the past providing FIS at LARS units and calling every bit of trafficm most likely because they were underworked at the time. You are totally correct in those circumstances, it would tend to make a mockery of FIS against RIS/RAS.
Hopefully these new services will make things clearer, but I have a niggling feeling that in 10 or 15 years time, we will be at the same position as we were with FIS/RIS/RAS until recently...