I only have a limited experience with GUI Widgets - by using JavaFX through `cljfx`

- vui.el seems like the right idea - You have a widget library, and then you add state management, you add layout management etc. It's sort of a blessing widget is simple enough to be reused this way

- ECS and inheritance. I have personally never really hit on this limitation. It's there in the abstract.. but don't GUIs generally fit the OO paradigm pretty well? Looking at the class tree for JavaFX, I don't see any really awkward widgets that are ambiguously placed.

- State Management. This can be bolted on - like with vui.el. But to me this feels like something that should be independent of GUIs. Something like Pathom looks more appealing to me here

- "Not a full reactive framework - Emacs doesn't need that complexity" .. why not? Maybe the library internals are complex, but it makes user code much simpler, no?