I think the ribbon concept is inherently flawed because no human brain can remember such an overwhelming amount of information (what command in which function group in which tab).
How is the ribbon any different to a hierarchial menu bar? (See the Gnome drop-down menu or the iOS Settings Menu).
You know, I just checked Finder and realized that not only does it not have the things showed in this mockup, but that I have never missed them.
Strange.
I can give you the steps, if you'd like.
The Finder has a lot of places you can perform operations on a file: the menu bar, the toolbar, the Get Info inspector, and the context menu. All the Ribbon does is turn them into buttons and put them in the same place. There's no remembering how to do stuff - and yes, some people can't remember how to do basic file management - because it's all done from the same row at the top. I could say the same thing about "Every function in the Finder I can do without having to use menus".