Some example uses:
Blogging Dapp: a user's posts could be stored on a server of the user's choosing and the DApp could allow the user to grant and remove access for their friends.
~snip~
Company Storage: a company can hold all its documents and communications privately on its own servers while making the data accessible to DApps run by authenticated users.
Imho you are trying to force the use of blockchain in places old-school storage (or even the file system!) does its job good and blockchain is not actually needed.
...but maybe it's only me.