I disagree that GDScript is a poor builtin language. It is somewhere between Python and JavaScript. It gets the job done and there is a lot you can do with it. Signals are great for things like state management. I'm not really sure what you mean by spaghetti code and how signals are supposed to help. I do agree that there are some annoying OOP aspects like providing a path to a scene (module). It's verbose but not unlike library imports in other languages.