However I have reservations on the software choice. Mobile OSes live and die depending on the app ecosystem that is available. If you want lots of people to use your system, your need the popular apps to be on board. That will be hard with a KDE or Gnome based UI, and a second class citizen web support. The developer community has millions of iOS, Android and Web devs, but likely only thousands of Gnome/KDE ones. Getting top-notch PWA integration could ease that but that's unlikely to be a high priority.
That being said, I feel they are happy with not being mainstream and that's fine too. Just different expectations.