Windows 7 had lower system requirements than Windows Vista. Windows 8 and 8.1 have the same system requirements as Windows 7, and in my experience often use less resources (presumably as part of their focus on mobile/tablet scenarios). The trend for the last 8 years has been one of reduced requirements, not increased.
That is the usual commercial bullshit, but when you have a recent computer bought with windows 7 that can not upgrade to windows 8, you understand your pain.
