Likewise, the iPod came seemingly out of nowhere but by watching the original launch you see it as part of a “media hub” strategy that envisions the Mac as a personal server. The very products which ended up disrupting the Mac/PC began as extensions of their victims.
You can trace the DNA of almost all of Apple’s products to previous products. If Apple did not have these foundations, the slow-motion revolutions would not have happened. Rather than a deliberate big bang, Apple’s disruptions are the result of a discovery process. A test, iterate and improve loop. This is why they seem obvious after the launch but also why they seem to be such an anti-climax.