What is a console grade renderer? Specifically, what's considered table stakes and what is Filament missing?

GL is way more optimized then Vulkan style rendering on most devices today. If you speed test WebGL2 with WebGPU on a mobile device the difference is huge for rendering a simple PBR model.

I understand what your intent is in saying this, and I agree with the intent, but for onlookers, you don't really need a lot to make a good game and this would likely be just fine. I don't actually know if it's possible to ship GL games on modern consoles now that it's in-fashion to have your own proprietary graphics library. That said, the way Google has factored the back-end of the renderer, it won't take a PhD to target one of those GPU APIs.

Aside: GL is still a good practical choice for games built by small teams.

This is a very interesting but also frustrating comment. If you're right that it's not a console grade renderer (not that I know what that even means) then that's really interesting - but why not? And could it be in future or is it fundamentally impossible for some reason?