When I tested Win8 (ages ago) I don't remember it going directly to the search function - pretty sure you had to manually select it. They've changed that since then.
I don't think they've changed to search so that it defaults to everything though.
The bottom line is this: Would you want to have to support Win8 for your parents or grandparents? Not everyone uses their computer enough to use/remember keyboard shortcuts or charm bar locations - for many people, if it's not clearly visible, it's not used.
While 8 is probably equal or more productive to those who put the effort in, but for the average person it doesn't do quite as well. And many of us, as the resident 'computer person', get to explain yet again that buttons appear based...