I think you’re grossly trivializing the effort needed. Let’s take art as an example. Art doesn’t exist in a vacuum. It’s targeted to explicit engine behaviour.

I think you’re grossly trivializing the effort needed. Let’s take art as an example. Art doesn’t exist in a vacuum. It’s targeted to explicit engine behaviour. It’s symbiotic with the code. You can’t just go from Unity’s universal pipeline to Unreals. And code is even harder. Forget language choice for a second, but logic itself is very tied to the engine. Unity’s monobehaviour architecture is very different to how one would write it in Unreal or Godot. That’s not even getting into engine specific optimization. what might be fast in one render pipeline will be slow in another. Scheduling is different. Also many developers rely on third party tools that aren’t engine agnostic either.