[theoctopus]

I'd assume the reason it's not advertised on the Mac App Store is because OS updates are now done through System Preferences.

[bredren]

I've suspected that notifications of upgrade opportunities and advertising of new versions may track with Apple's desire to pace rollout. For example, I'd be surprised if they hit every available device with the upgrade notification about ios 13 given 13.1 would be available only days later.

[tsieling]

It's in the Mac App Store for me, but not as the marquee product at the moment.