hydraulic fan motors...wtf?

My RAM SRT-10 and all Gen 3 Vipers have them. The story goes they had some extra money for development after Dodge was bought by Benz. So they spent it on a hydraulic fan assembly. It's free HP really. They are taking fluid from the PS pump tagg is already pumping and has extra pressure that's not in use so why not use it to spin a fan. After my truck sits for a while it sounds like a jet spooling up as the lines in the fan fill up. Biggest problem I see happening is if I ever have a PS leak or cut a line I'm not steering and I'm over heating.