An idea that is not feasible in FS2020 but may be in 2024: parallax occlusion mapping. It would go a long way if we could leverage it as it allows us to make many small details easily, without having to carve them into the model. That could range from little things like NACA ducts and cutouts, to large things like building parts and engine interiors.
I like this… unfortunately cannot vote… I have zero votes left… 
Great idea, I spent one of my last votes.