But this flys in the face of the huge amount of netbooks sold to people who want to do more then there smartphone can. You do want to do more then a mobile can do as people do find it limited.
An end user has certain things they want to do on a connected device - they don't need all the extras a full OS would provide. After the iPad was announced I sat down and thought of all the things I do on my laptop - practically all of them would be covered by the iPad with fewer overheads and an instant-on OS. 10 hours (claimed) battery life too.
I know of several almost computer-illiterate people who have embraced the iPhone and are doing all sorts of things with it they couldn't hope to do on a PC (or Mac) unless someone carefully set things up for them.
What Apple do very, very well is that interface between human and machine. Why make it more difficult than it needs to be? We don't expect our washing machines or TVs to need so much setting up and maintaining as the average computer.