I’ve experienced a bit of what you say when I went to a wide-aspect monitor and wondered what to do with that extra horizontal space. I agree with most of what you say about window/application management. However, I really don’t think it’s the place of the operating system to have window management embedded. I come from the Linux community where the window manager is an individual choice. Call it chaotic if you will, but there’s definitely more configurability that way. I would say more should be handled by individual applications, and less should be done by the operating system proper.