Because it is too different from other C-like DSLs GLSL, HLSL. GLSL was doing its job perfectly and there was no reason to invent another one. With wgpu, I now need to spend time on searching through its reference pages for things that I already know how to do in shaders. Now all countless WebGL tutorials need to be migrated to completely new syntax. This could be much easier by just making a superset of GLSL. And I had't got any sane answer on "why it should look like Rust?"