Why is it pants exactly? Its obvious why they have implemented it. If you look on the back of any software it tells you the system requirements. If you are not very experienced in PC's then how do you know if yours will support it? Its much easier for people to go into the shop and look for the sticker which tells you that your pc needs to be a 4.0 than to know what graphics card it has, how much ram etc. (Bear in mind, most people do not know what their pc innards even look like).
Its a good idea . . but does it actually work?
/rant