When asked at the All Things D conference by Kara Swisher why Apple does not have its own factories in China, Tim Cook spoke highly of the plants already in place. "We decided a decade ago that there were things Apple could do best and that there were other things that somebody else can do as well or better. Manufacturing was one of those. I think that's still true." Cook's comments come at a time when critics have been relatively silent on manufacturing plants such as Foxconn, while Walk Mossberg continues to question him on the subject.