It's funny how 7 seems to be the magic number with peak quality and usefulness in commercial OS development before it devolves into bloat and user abuse.

Android 7 was the last version before crazy restrictions like blocking screenshots for Incognito Mode started taking effect.

Windows 7 was the last decent version of Windows before it went downhill with 8 and then going full-on spyware-as-a-service with 10.

System 7 was the last release of MacOS before it started bloating.

OS X Lion (10.7) was the last release before Gatekeeper.

Any others I'm missing?