How ever you choose to clean your brass, I sure can't think of a single 'negative' associated with clean brass. I know several guys that are perfectly happy not tumbling anything, ever. Fine with me, I like my brass CLEAN. Like the way it looks, like the way it cycles, like the way it goes through the dies, like the way it feels in my hand. Just my choice for me.
I did think of one negative in regards to a particular method of cleaning brass: One time, going into deer season I had ammo to use from the previous year. They had dulled down so I polished them up by hand using Eagle One Never-Dull wadding. They looked like a million bucks (see what I did there?), too. Problem was, they were so slippery you could not keep ahold of them! Literally, slicker than snot. Only time I have ever regretted having clean, shiny brass.
