Should foreign movies really win Best Pic?

I really don't understand why some people now suddenly have the opinion that you can't be nominated for both Foreign and Best Picture. It has always been a possibility and f.e. it's also possible to be nominated for both Animated Feature and Best Picture (Up, Toy Story 3). Why did no one complain about that, it's exactly the same to what happened now. Also, this isn't the first non-American movie to win. Besides the many British movies, The Artist won in 2011/2012. And the Artist is a French movie. I don't recall any outrage back then, why is it now suddenly different? Is it because The Artist was a silent movie so people weren't smart enough to figure out it was foreign, I find it hard to believe that.