Those are legitimately interesting advantages - thank you for replying. Those would make really interesting deep dives blog posts / videos for making a case for Katana.
We haven't (yet) blog posts about Katana advantages, but if you want to try it yourself here you can find a very simple tutorial that will guide you in creating a very simple game
https://github.com/BendingSpoons/katana-tutorial-swift
It explores the core concepts of the framework and gives you an hint about how it feels to develop applications with this approach