If anything Apple have put so many restrictions on OSX and isn't pushing for much innovation on their side to allow people to build ever more powerful apps.
I understand general security concerns but I don't understand the critique of a company like Dropbox. They are doing the user er service not a disservice by finding a balance between pushing the platform forward while still taking your security concerns into account.
I would personally be more concerned with the fact that Apple haven't done anything fundamental for the osx platform in quite a while which is the exact opposite of what they have done for iOS.