[PoignardAzur]

I've looked at Houdini again and I'm not convinced.

First, because it's more like OpenGL 3 (add more powerful APIs) than Vulkan (clean room design).

Second, it seems mostly abandoned. The page you cited lists multiple sub-proposals that have "No signal" even from the Chrome team. All mentions of Houdini I can find on developers.google.com are from 2018. I can't find anything about Houdini integration with WebAssembly, which is what I'd expect if development was ongoing.

Overall, I'm seeing everything I would expect to see in the timeline where Mozilla has no intention of ever implementing Houdini, and Google has decided it's not worth pursuing beyond what's already implemented.