This storage provider allows you to use an NFS server like a native K8s storage provider, letting you to use mass storage for things like media or other large files. Why would this be useful? Things that you don't want to be replicated, for example, media (replicating 4.5TB can get expensive quick) or large data such as game servers! Of course, this does add a singe point of failure, but a lot less expensive than replicating data out to many nodes.
This is a companion discussion topic for the original entry at https://geek-cookbook.funkypenguin.co.nz/kubernetes/persistence/nfs-subdirectory-provider/