DXIL has the DirectX SDK tooling.

OpenCL history is more than relevant, without SPIR, there would not exist SPIR-V.

People love to blame NVidia for AMD and Intel failures pushing OpenCL into the industry, and Google completly ignoring it for mobile devices, pushing their own RenderScript dialect instead, even if Apple would have behave differently regarding their platforms, the other 80% market has completly ignored it.