Nice article :)
Progressive Web apps can be an answer to update-less app. It is actually a web-app packaged to run in Android/iOS phones. So every time you open the app, it is actually opening a web-app within and contacts the server. So no issues of sending updates to the clients. I hope this will get popular in the coming years.
I created a similar demo app for my learning here: https://quotes-pwa.herokuapp.com
PS: It even works without internet connection also.