Tumbling in ceramic media or stainless steel media is what commercial metal finishers do. It's used for deburring or even final polishing before black oxide or other metal finishes.

Yes, it is faster and more thoroughly cleans and polishes brass than walnut or corncob media but as pointed out, requires 100% inspection to make sure ALL polishing media is removed from the brass.

The upside is that stainless or ceramic tumbling only needs to be once in a while. My brass routinely gets the walnut treatment, and the stainless media is used for extremely tarnished or black powder cases.