Why would anyone need that when there's ghostery and noscript? Furthermore, what benefits does that feature have over ghostery? Seems like ghostery blocks more than that feature does, which makes it seem like that's a waste of effort.

I suppose it might have some use if it's actually on by default, but they haven't stated that it will be, and if it isn't on by default, then anyone who would know to turn it out would be able to install ghostery anyway.