@BenSouthwood @pimoore I think the only problem there is that's kinda true. I mean, if you're on just iOS and maybe also an iPad and you mostly do light work? Sure, they're great.
For example, I tried to save an image on my Mac a couple of days ago, right into iCloud Drive. It just broke, refused to work. I don't know if it's because of the app I was using but it doesn't matter; Apple is providing the syncing back-bone and that is not something that can be prone to error when you're working.
I'm confident they're close to finally solving this problem to the extent that other "feature not a product" companies have done so for years but I have a sneaking suspicion that they need to iOS-ify the Mac some more before that is true.