I think I understand the idea.
Let’s say he has a thousand files in a folder, and he goes all the way to catalog them with star ratings.
Let’s say that the only images with 5-star rating are no.37, no.490, no.650, and no. 915. Those are the only ones he wants to process, and the only ones he wants to see in RT file browser, so he doesn’t have to look over the entire set of images to find the desired ones.
From my point of view, not an unreasonable idea, but I don’t know if it can be done.