Soon after the first iPhone was launched, it was fairly easy to see that it would, by its design, eventually subsume the iPod. We watched it coming and expected iPod sales to wither. But in the case of the iPad and the Mac, the progression isn’t so clear. In these uncertain times, Apple could do a lot, with marketing and product rollouts, to provide warmer fuzzies about the roadmap (without spilling any secrets). Page one of Particle Debris set up the discussion, and page two cataloged some cases about how Apple’s lack of messaging, via product design, is creating customer angst.