I am not going to be that guy and keep challenging you when I know that you are right - I did some research, and indeed, flat keyboard makes for a better "healthy" experience than angled. Learned something new.
That said, the research says that type such that your wrists aren't stressed. And I can tell you that I use the MacBook Air on my lap and naturally, sitting down, there's an angle, and the way Air's keyboard angle was, it did make for a fantastic typing experience vs. Pro. But, you are absolutely right here.