Comment by _rousbound

I wonder the same thing, but with an emphasis on app mobile development.

Godot from project setup to running on my Android is way more effortless/lightweight experience than doing the way of AndroidStudio and/or Flutter stuff.

What I dream of is making a Lua binding for essential godot GUI control nodes using GDExtension and using this LibGodot to own the engine loop, so I can do all the app code in Lua.

So, I may have drifted away from your question, but the point is that I love Godot for gaming, and I can handle GDScript plus the engine editor, but for writing a complete application I would want to develop in my language/editor/ecosystem of choice.

In that sense, LibGodot(plus GDExtension) may help indirectly developing GUI applications by letting people own Godot in their ecossystem of choice.