Think about it this way: the blade is a second control surface that allows you to make use of the full screen for data or other touch UI.
In audio mixing it's common to have an enormous digital mixing board that's linked up to the mixing software, so that you can fill most (or all) of the screen with the data you're actually working on. Some of those boards have literally dozens of channels with individual sliders, buttons, etc.
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Think about it this way: the blade is a second control surface that allows you to make use of the full screen for data or other touch UI.
In audio mixing it's common to have an enormous digital mixing board that's linked up to the mixing software, so that you can fill most (or all) of the screen with the data you're actually working on. Some of those boards have literally dozens of channels with individual sliders, buttons, etc.