WebGPU is about a decade behind in feature support compared to what is available in modern GPUs. Things missing include:

- Bindless resources

- RT acceleration

- 64-bit image atomic operations (these are what make nanite's software rasterizer possible)

- mesh shaders

It has compute shaders at least. There's a lot of less flashy to non-experts extensions being added to Vulkan and D3D12 lately that removes abstractions that WebGPU cant have without being a security nightmare. Outside of the rendering algorithms themselves, the vast majority of API surface area in Vulkan/D3D12 is just ceremony around allocating memory for different purposes. New stuff like descriptor buffers in Vulkan are removing that ceremony in a very core area, but its unlikely to ever come to WebGPU.

fwiw some of these features are available outside the browser via 'wgpu' and/or 'dawn', but that doesn't help people in the browser.