That sounds like a poorly made Mac, I would never use that model. While Macs are overpriced, people buy them mainly for their software. Macs run very smoothly because of their OS, and while they were never built with gaming in mind, they perform excellently with any other task. Unfortunately Apple is now making stripped down Macs that aren't even worth buying, hopefully they don't sell well because it's stupid to get rid of USB ports when so many devices use it. The Apple watches don't sound worth it either, an iPhone can do all the same tasks.
I'll be honest here, it has its advantages, but only in specific scenarios. If you want an incredibly lightweight, long-lasting note-taking device, and are willing to drop big bucks, this is probably the thing for you. But that's pretty much all it is, a notetaking device. Also, 5 watts for a processor? Even I gotta admit, that's really good.
But even then, no USB would be quite a hassle. There would be... practically no way to transfer data that I can see, unless it has some form of proprietary data transfer port.