We often hear saying game engines redraw every frame so it is not appropriate for UIs.

In Godot, you can set an option to redraw only when something change like in UI libs (for e.g Godot Editor use this option)

However , I think one main aspect missing from UI libs is damage tracking (=redraw only the part of the screen that changed and tell the compositor to also only redraw that part).

In terms of architecture, Godot is all I want. I wish I could build general purpose apps with it. Everything is a node & just simple trees. Abstraction of everything you need over all platforms. GDNative let you access everything from any language.

I really wish I could build everything with Godot. I enjoy it so much more than web dev or android dev even for UI