I know he is not active working on it 
And the other bad thing about ubershaders, they tend to be *very* heavy for the GPU. So if the game renders lots of content with the new shader, it's maybe faster to wait for the compiled shader, than to render a single frame with the ubershader.

And the other bad thing about ubershaders, they tend to be *very* heavy for the GPU. So if the game renders lots of content with the new shader, it's maybe faster to wait for the compiled shader, than to render a single frame with the ubershader.