To me, that means the sun interior scene should perform better than 1%. There should be direct light from the sky as well. If you need 10000 samples to clear the dark corner (indirect only), it should stop at 1000-2000 for the rest of the scene that doesn’t require that much. Today I would have to live with 10000 across the whole scene, live with the noise, or remove the sun (preferred :p).
Isn’t that what adaptive means?