Larger rounded corners, taller toolbars, and more padding within sections all further reduce the amount of actual content you can display. If you look at most

Larger rounded corners, taller toolbars, and more padding within sections all further reduce the amount of actual content you can display. If you look at most of the before/after screenshots, there's clearly less information delivered within the same amount of screen space. That's nice for a touch interface perhaps, but it's counterproductive for a computer. And making toolbar buttons all monochrome outlines does make toolbars have a more consistent appearance, but that actually makes finding the button you need more difficult. The differences are what we notice, and later what our brains automatically key on when we need to actually use the interface. Less than half of these changes are arguably worth having. The rest seem like marketing saying, "We need to be fresher, guys!" Using a new interface can be fun because of the change, but that fun quickly wears off. Then we're left with the realities of the interface. That Finder window is going to be much less useful in the real world with real file/folder names that are longer than 12 characters wide. This is a UI for casual users. It might be good for grandma, but it's less good for people who need to get work done.