It didn’t cover iMessage, as that didn’t come until a few years ago. We didn’t get that until iCloud Photos came in iOS 8. The problem was it didn’t cover all of our photos. All of our devices had connectivity built-in, so data should be available everywhere.
Jobs pitched demoting the Mac and moving the digital hub into the cloud. Back when Steve Jobs unveiled iCloud in 2011, we were pitched a vision of data being available everywhere.