Comment by aleph_minus_one

> I wonder if there'd be any value in someone making a FOSS engine-agnostic editor designed to be as easy and powerful to adapt to any other engine/framework/etc as possible.

I see one problem (there very likely exist a lot of others) in the fact that a lot of frameworks and engines are "deep ecosystems" that take a lot of effort to get deeply into. Once inside the engine ecosystem, a lot of concepts are "very integrated/intertangled" (though not necessarily in the "best possible way").

So, a lot of implementation time will have to be invested for each individual supported engine so that the editor properly integrates with it.