Not a KaiOS user, but I am a daily flip-phone user on a Kyocera DuraXTP running Brew MP. In my flip-phone dreams, the features I would love out of an OS would be:

  * Obviously, calling/texting.
  * A fast, minimal app that served as a phone book.
  * GPS with voice assistant.
  * An Uber or Lyft app.
  * That's it.

In short, the things that are very useful in an emergency-type situation.

I can't imagine there are that may others like me, but the lack of GPS and ride-hailing are the two things that occasionally make me consider going back to having a smartphone.