Distribution is king, and distribution is now impossible on mobile. Even for an app that is useful, beautiful, and genuinely needs to be on mobile... you're wasting your time. This is why open web will always win.

Good summary of the Medium post, Joyce. 

See also "Nobody Wants Your App":

https://medium.com/swlh/nobody-wants-your-app-6af1f7f69cb7

The only mobile app categories that succeed, in no particular order:

1. Messaging (SMS, WhatsApp, Messenger, Slack…)
2. Calendar
3. Maps
4. Email
5. Camera / Photos
6. Transportation
7. Music
8. Social Networks
9. News
10. Candy Crush

There’s a reason why they are popular on mobile: they are highly contextual and take big advantage of the phones main functionalities, be it geolocation, camera or just voice and sound. They are also aimed at repeated use in small chunks of time. How many times did you open Messenger or your email app today?