I've personally implemented mesh shaders in my own project, and there are plenty of examples of WebGPU real time raytracers out there. DirectStorage I had to google and it looks like a Windows DMA framework for loading assets directly to GPU ram? That's not even in scope for WebGPU, and would be handled by platform libraries. Linux has supported it for ages.
Seriously I get the impression from your posts that really don't have any experience with WebGPU at all, and are basing your understanding off of misinformation circulating in other communities. Especially with your continued nonsensical statements about not supporting "post-2015 features." 2015-era chipsets are a minimum supported feature set, not a maximum.
Please just take the L and read up to inform yourself about WebGPU before criticizing it more.
DirectStorage started as a Windows feature, is actually quite common in game consoles, and there is ongoing work to expose similar functionality in Vulkan.
Yes, I do have WebGPU experience and have already contributed to BabylonJS a couple of times.
Maybe I do actually know one or two things about graphics APIs.
https://dawn.googlesource.com/dawn
https://eliemichel.github.io/LearnWebGPU/
Yes it is exposed to Javascript applications by browsers that support it, much like WebGL exposes OpenGL ES. But that’s a separate thing.