macOS High Sierra tech preview: A quick look at the stuff you can’t see

Even by the standards of recent macOS releases, this year’s High Sierra is shaping up to be a low-key release with few high-profile user-visible improvements. Apple’s highlight page covers quite a few things, but in most cases they’re iterative tweaks that would mostly belong in the “grab bag” section of an overview of, say, Leopard or even Yosemite.