As Apple’s fistful of operating systems (iOS, iPadOS, macOS, tvOS and watchOS) matured, fissures formed, differences sprouted and a grand unification became almost necessary.

macOS Catalina, available now, is a major piece of the puzzle for year of Apple’s grand realignment: killing iTunes, nuking legacy app support and making games matter again for Apple computers.
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https://www.laptopmag.com/articles/macos-catalina-review