Regardless of the OS, if you're using the computer for anything productive, the application software, not the OS, will eat the majority of the RAM anyway. If you're looking at the minimum requirements, chances are you're not looking to do anything besides browsing the web with 5 tabs open.
It sucks though, I agree - software should get more efficient over time, just like hardware does. Out of curiosity, do we have anything more specific, i.e. how they tested that, what apps were running and so on? Or maybe they now deem that more things should be running?
