Dark Mode and iOS apps make this desert-themed release feel surprisingly verdant. I ended last year’s review of macOS High Sierra by lamenting its invisibility but praising the much-needed work it did on the macOS foundation. There weren’t a lot of ways to tell that a Mac was running High Sierra instead of Low Sierra, but Apple quietly replaced the file system and the system’s window server and added (and later finalized) official support for external graphics, among a bunch of other tweaks. The yearly release cycle just kept Apple from actually building a whole lot of new features on top of that foundation.