If all you want is more static checking, it doesn't much matter if the graphics API consumes GLSL or SPIR-V. SPIR-V is mostly about factoring out part of the op

If all you want is more static checking, it doesn't much matter if the graphics API consumes GLSL or SPIR-V. SPIR-V is mostly about factoring out part of the optimization phase from the driver to the compilation process. This speeds up the process of loading a shader, and more importantly lets developers control aspects of optimization they couldn't before.