Authentication and identity management comes to mind immediately.
But, of course, there are plenty apps that prefer to do things locally, for so many reasons - if Spotify downloads songs, it does so locally. Or a note taking app such as Evernote needs to capture and compress whatever was drawn on the screen. Not to mention games!
If you think about more than CRUD apps, you’ll see that there are plenty things to be run on the device which are independent of UI.
But, of course, there are plenty apps that prefer to do things locally, for so many reasons - if Spotify downloads songs, it does so locally. Or a note taking app such as Evernote needs to capture and compress whatever was drawn on the screen. Not to mention games!
If you think about more than CRUD apps, you’ll see that there are plenty things to be run on the device which are independent of UI.