I see it as a (potential) storage format. As we move away from triangles and towards ray/path/etc tracing (in whatever forms) we want to still have content (be it captured or crafted) in it, that we can render with things like "infinite" details, bounces, and other meta (reflectancr etc).
All current forms of triangulation/meshing from fractcals, sdf, point clouds, etc, are relatively terrible and constrained, to fit existing pipelines (hence why most AR is just lackluster model viewers)
Make it differentiable is a step towards cramming it into a small model and output other forms, or trace directly, or just compress before say, extracting to some Tree-renderable format on the gpu