Messages will now sync between all your devices using iCloud. Reader mode presents articles in just text and images form (similar to Pocket).
This way you can skip the ads, navigation, and other distractions. Safari in High Sierra can automatically open supported web articles in Reader mode for you. You can customize the page zoom, autoplay, content blockers and whether to use Reader when available. In Safari, you can now specify specific viewing features that app to an individual site. Still, other than the big headlining features like APFS, and VR support, there are a lot of small hidden features spread across the OS. This is the year that Apple makes everything run smoother and faster (and hopefully, more stable). It’s a classic refinement update, in the same lines of Snow Leopard and Mountain Lion. MacOS High Sierra is not a huge update to macOS.