I feel that what Apple is doing with the iPad is trying to create a whole new separate paradigm of computing with glass slabs, without re-using the good ideas from the Mac. Whether it's pride or something else, they simply can't make themselves do a dual-use operating system (e.g. support for overlapping windows, mouse, file management - while still having good support for touch), so they are forced to come up with totally new ways of interacting with devices. While that's pretty interesting and totally fine, there is also a reason why modern MacBooks (and computers in general) are the way they are, so all the solutions are second-rate, and it's why professional users will always feel limited when using the iPad for things that are not just watching YouTube videos.