Please, you must consider offer shared storage (NFS, Gluster, ...) as service.
Deploy NFS using droplets is too slow, cannot use for production systems.
Shared storage is critcal to provide high availability in webservers.
We are definitely looking at this. NFS as a service is actually one of the tricker storage as a service offerings to get right. There's pros and cons to doing it and it is not something we have decided for or against, just know that it is on or list of potential future offerings that we have and will continue to consider. If we feel there is a mature enough technology to build on we will definitely consider it!