I would think, if anything, it would be for creating a UI for a Godot-native game (after a prototype stage where the UI is Godot-native programmer art); and being able to break off the responsibility for that component to a UI team that can simply hire React frontend devs to do the design and development, where those devs don’t need any knowledge of how Godot works. Architecturally, the game UI wraps and controls the game engine, because of course it does; but organizationally, the UI team would serve the needs of the game dev team, rather than the other way around.

Good thing that React devs usually don't want to have any knowledge of anything else to begin with.