1. monolithic pipelines, pretty much no hardware works like that, the hash-and-cache design makes your design inflexible and adds a ton of overhead

2. WGSL, like come on

3. Hilariously outdated feature set, no mesh shaders, no HWRT, cooperative matrices/tensors, etc.

4. It's security-focused because web untrusted code:tm: so most of the calls are hilariously slow. Yes even the desktop implementations. There's no good webGPU implementation out there

5. it's also not simple to either implement or use. it's basically vulkan's difficulty without any of the advantages....