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I think what's missing is game engines having actually good level design tools. No need to overthink it i believe.

I don't know how feasible it'd be, but in theory It'd allow you to move from one engine to another while keeping the same tooling, in the worst case having to write a custom client for the engine. It's something I'm interested in prototyping myself, but does something like this exist?

I think you'd be better off getting a blender hot reload solution running than basically trying to reinvent blender.

I've seen palworld and if I remember right, subnautica as well do this in their testing phases.