There's a lot of functionality that a general purpose UI library has that Godot will likely never approach, like support for input methods in text editing.
Productive applications require extremely robust text editing, something that game engines don't spend a lot of time with. Stuff like selection, text input for non-English keyboards, IME popups, that sort of thing. Even RTL text display is usually minimally unsupported.
I also don't know of any game engine that supports multi-window display in any coherent way.
Productive applications require extremely robust text editing, something that game engines don't spend a lot of time with. Stuff like selection, text input for non-English keyboards, IME popups, that sort of thing. Even RTL text display is usually minimally unsupported.
I also don't know of any game engine that supports multi-window display in any coherent way.