Nothing to do with "nannying", its all down to longevity, obviously the big racing teams could care less about changing the engine every race, but many people like to have some sort of protection for the engine.
It's all very well saying throttle pedal and common sense, but when you are at 100% concertration on a track, the last thing you want to be worrying about is weather you are going to over-rev the engine and blow it, you want to be concentrating on driving/riding.
I am extremely glad my bike has an adjustable shift light and rev-limiter, riding a bike fast on the track is WAAAAAYYYY more involved than a car, and you need all your concentration just to keep it on the track.
You call it nannying, I call it sensible.
Dan,