I also take pride in not cleaning my brass - never saw the point of doing that except to make it shiny for the sake of making it shiny. Does it affect case life - no, does it make it easier to detect cracks / incipient head separation - no, does it make it easier to find the brass in the dirt - no.
I wash it to get any grit/dust off it, but otherwise like you I don't see any point in making it shiny. Not only does it not make it work better, but the patina a case develops is actually slightly protective. I see no good reason for adding a process step, time and cost to do no more than remove that. Same goes for cleaning residue out of primer pockets, another process step for which I've found no benefit.
