This is a weird time in the technology world. The traditional PC, strong for four decades, is on the wane. The smartphone is dominant, devices so powerful that they can rival the power found in those traditional PCs. We’re rapidly exiting the era where devices were differentiated based on raw computing power, and entering one where ergonomics becomes a defining factor.
(No, I’m not saying that there aren’t cases where PCs still have more power than phones. I’m saying that away from high-performance edge cases, the differences are increasingly small.)
If we accept that an iPhone can do most of the work that most people need a computing device to do, where does that leave the iPad and the Mac? It means that they’re defined by their shapes, by how we control them and hold them and look at them. A MacBook is a good choice because it’s got a big screen attached to a hardware keyboard and a trackpad. An iPad is a good choice because it’s got a much larger screen.