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    I don’t understand why you’d hide that icon. It doesn’t save screen real-estate if you have to reserve the space to unhide it. It makes your cursor movement less accurate if you have to guess where it is until you click on it. It makes the fact that you can drag it far less discoverable (how many Mac users now will figure out that you can email the doc you’re working on by dragging that icon onto the mail app’s dock icon, or add it to the current command line by dragging it to the terminal?). This functionality is one of the things that makes the Mac desktop a more seamless experience.

    I see this as more evidence that all of the fantastic HCI folks with a strong background in cognitive and behavioural psychology that I used to admire at Apple have retired and been replaced with ooo-shiny UX people.