See also: what happened to the iWork suite back when the '09 version got "upgraded" to a lowest-common-denominator garbagefest. Keynote, for instance, used to have tons of really powerful control palattes you could spread out around your screen to control everything (kind of the way Adobe Creative Cloud apps work). Now it's got one ****y inspector that you'll find yourself constantly switching around to its different functions. Why is this? So the interface can be more or less identical on iPad, Mac and iCloud.com. I'd rather my Mac apps remain powerful, not get crapped down to the level of what iOS devices are capable of dealing with.
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To be fair, there is now the Files app for what that's worth. When working in apps that plug into it correctly, it's quite decent. It's no Finder, of course, but it at least lets you open/save to proper folders that sync over to your Mac.