Features

Apparently even in the Stable channel, features are still A/B tested, and so random users will see some of the advertised new features, and others won't. Which to me, frankly, is stupid. If Microsoft want to test features, that's what the Dev (Beta) and Canary (Daily/Alpha) channels exist for; Stable should provide a consistent experience for everyone. It's beyond silly to advertise features that are in a new major-version, let news publications do write-ups, but then have users find those features aren't actually there yet!

If Microsoft know in-advance a feature is still "not-quite-ready" then hold it back until the next major milestone release instead!