Reading the documentation, I just notice lots of familiarity with my own solution using haskell and gi-gtk4. I think that anybody that read https://bichanna.github.io/posts/tea-time/ will get the same ideas. This basically boils down to:

1. Use a native widget system such as GTK (I evaluated Qt too)

2. Wrap widgets into a component datatype that is aware on how to update the widget when the props/model changes.

3. Define a dispatch closure that is passed to widget that accepts messages. Actions on the widgets should use this instead of mutating a reference.

4. That dispatch closure is component aware and it will call the update function on all the widgets.

There are some extra complications for long running computations but the model is a good base to build on. I wish the best to the relm team, most likely I will use them when programminmg in rust.