When you get home do you set your car keys on a table or place them in a drawer with other keys? The latter means you'll be hunting in a drawer on your way out the door. Even if you reserve a corner of that drawer for your car keys. The former means you will see your keys all the time and within quick reach. You can make things go faster if your keys hang from a series of hooks on the wall between you and the door. Now they're not in your way but totally accessible.
So why would you go hunting through some pull-up menu for your applications when you can simply make them appear with the push of one button?
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