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I love new features, don't get me wrong, but not at the cost of them cluttering up the UI with features I rarely (or never) use. The sidebar on the web keeps growing with no way to tame it. How about...
Dropbox please hire a few UI experts. The right side bar takes up a lot of real estate, is mostly blank, and nobody asked for it. Collapsing of sidebars is standard UI design, even Adobe Acrobat has it (and Adobe isn't exactly at the forefront of UI design).
The general pattern is this: Dropbox adds features that nobody asked for instead of adding those that thousands of users have been asking for for years, such as better file search functionality.