[robski]

I think your find it's a feature that dates back to the first automatic film cameras. Probably not much use these days with digital. The very rare occassions I would use it is where I am not sure what part of the scene to expose for.

Remember loads of the features on a camera are only there as a tick box in the advertising. If camera A has it so must camera B. The fact that most people will never use it is of no consequence.