Filesystem persistence removes a whole host of complexities from applications For instance, I would no longer have to store files on a server, I could simply s

Filesystem persistence removes a whole host of complexities from applications For instance, I would no longer have to store files on a server, I could simply save them locally for the user, which makes it easier for them to have portable files, use it with other apps etc. It also reduces the startup cost of some apps. If for instance I wanted to make a photo editing app, its going to be cheaper to store edited photos back onto the users device, than it is for me to upload them to a server and store them, especially over time. It removes alot of developer overhead and it has benefits for the user (IE, the files are more portable, since they're on your machine, not someone elses). Currently we are perpetually stuck with having to re-create virtual representations of file systems and they aren't the same thing, not by a long shot.