The argument is more app innovation is happening on mobile apps than PCs these days, and the simpler paradigm allows for more concise workflows and you can do a good deal more of your stuff just carrying around a iPad or even from your phone than you can when living in a MacOS world.

HN is probably the wrong audience because windows and filesystems are uniquely well suited abstractions for developers who have umpteen workflows and use cases of significant complexity. However observing how huge an improvement an iPad is for my joe-sixpack relatives, I think it's worth exploring the idea of how far can iOS can be taken by power users. I certainly think it could feasibly meet the needs of specific creative professionals like writers, designers or video editors.