Because it's missing (interesting) content maybe?
Content is a bandwidth issue. If you need so much bandwidth for a flat, planar 4k stream, how many more do you need for a 100 planes (still pretty flat IMHO) for depth ? Or 1000 planes ?
Maybe it can explode with Gaussian Splats, since it's a convenient way to save a volumetric scene, but, until now, no one made a Gaussian Splats video, so I wonder the bandwidth and processing power required for these too.