My view is that that digital design has matured to the point where designers no longer feel they have to wow users with lots of effects and visual flourishes, allowing for a more purpose driven design. My hope/opinion is that is here to stay.
From windows XP to 7, the windows default themes and colors where disturbingly flashy and "in your face". OSX was more bland but aqua was still kitch and unneedingly strippy. iOS6 app's ultra textured or "realistic" interfaces were the peak of that trend IMO.
In the real world, not everyone likes kids playroom colors, nor grandma's 60s style wallpaper, nor steam punky design, nor green-blue metalic robot parts. Personally I like MUJI style clean and clear design, and I feel like it took that much time to have a core of people to value cleanness and simplicity in computer UI design as well.
Also, it's kind've ironic that you can now have a 5k display to show off your flat, monochrome circles...
I'm sure there have been at least some regressions in some aspects of some user performance measurements, but it seems really clear at this point that it hasn't been a catastrophe… or even a significant problem.
Also, it's a bit much suggesting that it's flat design that's what's responsible for smartphone uptake. If that was the case, then hell, it was skeuomorphism that exploded the market in the first place.
It's not like we're abandoning everything, it's more about discovering new ways of doing things and then mix and matching until we get to something useful and coherent.
http://cdn.arstechnica.net/wp-content/uploads/2014/10/time-m... | http://cdn.arstechnica.net/reviews/os/mac-os-x-10-5.media/ti...
So moving on, cloud looks like a safer approach to backup because no friction. Yes, data security, etc. From a public service POV, though, for 99% people out there, I bet the trade off is hugely favorable to cloud stockage vs local disk failure.
So now - is iCloud drive sexy enough to want to use it? Actually that's more like the problem, it's definitely not.
One of the things that has always turned me off from OSX is how it looks. I must say Yosemite is the first mac OS that actually looks appealing to me.