No, it's not the exact same thing. Single tapping a mouse is selection. There's no waiting for the second tap because an item can be "selected" for a fraction o

No, it's not the exact same thing. Single tapping a mouse is selection. There's no waiting for the second tap because an item can be "selected" for a fraction of a second before it's opened. A home button can't take you home for a fraction of a second before the multitasking bar opens, so every home press has to wait before it can know what you intend it to do.