Off line access and chromebooks

Just curious to know, how to perceive on local storage and off line access of chrome books. Chrome is HTML 5 compliant and thus every site can leverage local storage, session storage and web SQL anyway. And I guess web SQL in chrome is nothing but a SQLITE instance. When all you can do is accessed through browser and each site having a site specific solution, is there still any need for disk storage on chrome books? If yes what could be that scenario?