macOS 10.12 Sierra: The Ars Technica Review
When Mac OS X (as it was then called) first moved to a yearly release cycle in 2011, Apple had trouble defining its scope for each release. Lion, the first in this cadence and the first release to pull in a significant number of features from iOS, feels like a half-finished version of Mountain Lion in retrospect. Mavericks stripped out some of previous versions’ skeuomorphism and superfluous texture, but the Mac didn’t fully match with iOS 7 until Yosemite came out a year later.
Further ReadingOS X 10.11 El Capitan: The Ars Technica Review
Since Yosemite, things have felt more tightly controlled, more planned. El Capitan and Sierra both designate one or two big “hero” features for Apple to plan its marketing around (window management in El Capitan, Siri in Sierra), a decent range of medium-sized changes, at least one big under-the-hood addition (System Integrity Protection in 10.11, the Gatekeeper stuff in 10.12, and APFS next year if all goes well), and a smattering of minor improvements to the core apps.