There's also some marketing talk here as well;
"Once assembled, the links are brushed by hand to ensure that the texture follows the contours of the design."
This would seem as the alternative is brushing by machine, which isn't feasible at all. I work solely with 316L and 106, and I can tell you, we have to brush large sheets by hand to get the lines straight and pretty. Doing small bits by hand is a must, as it's impossible to get a good result with a machine.
Thanks for the insight. How time consuming would you project this process to be. Seems like it would take some time do do a single band. Apple has to price this band high enough just so they can keep up with the demand.