Your Godot scene doesn't work in Unreal Engine. I always felt that composition is unnecessarily hard in game engines infrastructure. I do web development as a hobby, and any .js file targeting the DOM works on any browser. I can't even run GDScript in Unity!

You're just comparing the wrong things. Yes, when you're locked into one environment, everything works together well. The moment you interact with outside systems, all hell breaks loose. If anything, what you're saying is just that platforms should have a much larger stdlib, or abstract platform differences properly (hint: this is only doable if you're a game engine and can afford to absolutely ignore _everything_ the OS does and just concern yourself with reinventing every wheel).

Not to say there's nothing good in the games side of things: a bunch of software could benefit from accepting that some systems like a big fat central message bus and singletons can be good when handled well.