Very easy. The whole keynote was very underwhelming for the Mac. The whole platform has been asleep for years now. Meanwhile, Microsoft has come out with Windows 10 and is actively focusing on it. I don't necessarily like Win10, but at least it's a major effort. I remember back a few years ago, and the Mac platform would receive quite a few new features that made using it better each OS update. Each update was big. It's been well over 5+ years since an update like that now. What Apple has given are relatively small incremental revisions, more akin to what MS is delivering with their twice a year "creator" updates - yet MS is doing it twice a year to Apple's once a year. Where is Apple's answer to Win10? I never use Siri (and no 3rd-party app support on Mac). Mac Messages doesn't support many of the features of the iOS version. There are still no HomeKit or News apps for Mac. No ApplePay peer-to-peer on Mac. The Mac App Store has been languishing for years. Even if Apple isn't going to add new Mac-only features, I don't understand why they don't bring the apps inline with what's available on iOS. Preferably though, I'd like to see new Mac-specific enhancements. I'm glad to see eGPU support, but that won't mean a lot for Mac gaming without updated OpenGL or Vulkan support. It will be hard to port cross-platform games to Metal, especially when there just isn't a huge market. Metal 2 is good, but I would have preferred to see Vulkan support. I personally believe VR is a fad and won't be the future. This is all marketing and has little practicality. H.265 is good, but is going to take years to mainstream & really requires new equipment. What else is there for Mac? Safari has auto-play blocking and Photos is a bit better. I thought Sierra was greatly underwhelming last year, but I kind of convinced myself that Apple must be working on something truly substantial for the Mac that we'd see this year. That didn't happen. Actually, in hind sight, Sierra had many more new features than High Sierra does (iOS 10 did too compared to iOS 11). I think if 2018 comes around and there isn't a substantial MacOS update with Mac-specific enhancements, than everyone really needs worry.
I'm a big user of ZFS and snapshots on Linux. It's great. Apple finally has a modern file system with modern features like snapshots, so I don't understand why Apple is not taking advantage of it throughout the OS in a way that shows it off. Like TimeMachine snapshots. Built-in file versioning across the OS. A new OS update routine, with background in-place updates using snapshots (on iOS too). Something. That's why I said it seems like Apple just isn't putting in the effort to truly take advantage of the new underlying technical tools they have on the Mac, which I find disappointing. Or, they don't want to put in the effort on local file storage and backup when they would prefer everything move to iCloud.
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Out of curiosity, does anyone know what the local APFS snapshots are doing? Are they enabling any new features? Backups/Versioning? If not, than I wonder what the point is.