Thanks everyone for the input!
Looks like the Discourse community is well served.
We released the xenForo mobile app template not too long ago, along with a generic mobile app that connects to any xenForo forum that installed our extension, similar to what Tapatalk did back in the day, except it is now open source. You can download our app or view the source code at:
Push notifications is also working and works out of the box.
We were thinking if it is something we can offer to the Discourse community, but looks like it is not something too valuable given the number of choices already out there.
In any case, let me know if Forum Copilot can do more for everyone. 