Another way to look at it: The whole point of Nanite is that you make the shape in geometry, not in shaders. You should be able to model the geometry at a high enough resolution that you don’t need the shader-level WPO.
Btw, that box does not look like it has “a lot” of verties – if you want it to have real definition at the fine-grained level, you need like 100x more vertices. That’s where Nanite really shines!