It seems like the old "set your pagefile manually so you never have to worry about it growing/shrinking" trick from Windows of yore - they are grabbing that much so that they don't have to grab more at any time. It's basically a promise that, while those 7 GB are the systems now, you'll never have a problem where you run out of storage space due to an update (assuming after they reserve the initial 7 GB).
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It seems like the old "set your pagefile manually so you never have to worry about it growing/shrinking" trick from Windows of yore - they are grabbing that much so that they don't have to grab more at any time. It's basically a promise that, while those 7 GB are the systems now, you'll never have a problem where you run out of storage space due to an update (assuming after they reserve the initial 7 GB).