The iPad never meant you don't need an iPhone (and hardly ever meant you don't need a Mac/PC).
The idea that a device should replace previous devices was never much of a concern. The only thing that qualifies 100% in that story is that the iPhone was by nature also a portable music player -- and if you had one obviously you didn't need the iPod. Apart from that, all were individual lines, with their own strengths and limitations -- not supposed to replace one another.
