Obviously not everyone will see the point in it. It depends on what you are making, and how clear you want it to be. It's not always a matter of clarity though, but rather a method for removing additional sediment that might have been kicked up or anything that has neutral buoyancy. This could be useful for anyone who used anything like fruit, chocolate, or hops. Anything that might change the viscosity of the beer to something thicker or containing more particulates than preferred. With all things on this forum, it's how far you wish to go with a beer and what you wish to do with it.