The vast majority of the market didn't need an iPhone at all until it was introduced. If you enable compelling enough use cases people will find ways for them t

The vast majority of the market didn't need an iPhone at all until it was introduced. If you enable compelling enough use cases people will find ways for them to fit their workflows, and/or come up with brand new ones. It was a compelling value proposition to Crackberries of the era; Apple clearly did market research before flinging it to the masses. Danger Inc / Google were already converging on this with their first Android. The biggest hurdle standing in the way is that making a single one of iPhone/iPad/Mac too powerful (in terms of usability, not just raw processing power) will take away sales from the other two. Cannibalising their product line is probably the most plausible explanation, but I'm sceptical. I reckon it's just that they haven't found a "killer" use case for it and probably bottom in the list of ideas for improving the product (if it even made a list).