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But writing an entirely new, bespoke high-level shader programming language is more robust? And robust in what way? The SPIR-V format is vastly easier to parse than a textual language.

And WGSL will still bounce through HLSL for DirectX because DXIL is an awful, undocumented mess of ancient LLVM-IR with a giant pile of bolt-on special semantics. Directly authoring DXIL is awful.

You could always translate to DXIL directly, though the Chromium team has brought up drivers are used to DXC's output

No need to transcode to HLSL, DXC already accepts SPIR-V input (and both Chrome and FF are shipping DXC).