Understood. I was talking more in the case of doing multiple final renders (esp when doing animations) where you can then get a significant time saving.
Anyway, the denoising process is not controlled by Rhino Render or Raytraced (yes, you can denoise in the viewport as well), but by the post effects pipeline. That is the reason why the denoising is available as a post effect.
Maybe create a new thread in the #rendering category and request improvements you feel are needed with these (:
a better texture for the wall in the back, it’s scaled too large and looks too rough. Get yourself some textures from Quixel Megascans. Just sign up with an Epic Games account and then you get Megascans and Mixer for free. Good textures will elevate your renderings like nothing else.
the wood for the ceiling is unrealistic, since it would almost certainly not be CNC milled out of solid chunks of wood. So go for something more realistic, maybe not with the rounded corners. Alternatively just use a different, more realistic, material