I think there some use cases for internal business apps, eg create some UI elements, open a websocket, write to database, and provide an icon on the mobile home

I think there some use cases for internal business apps, eg create some UI elements, open a websocket, write to database, and provide an icon on the mobile home screen. In terms of general apps, the major problems are lack of Safari support (push notifications for example) and access to the hardware/OS level stuff (like can I get the phone number of this phone without a Native App? Can I auto-focus the camera? Can I get the contacts? No, no, no you can't)