The first problem with the article here is that some of the buttons (Move To, Copy To) did not exist previously. They are also extensions of existing functions (Move, Copy) - so concluding that half the UI is covered by buttons that were not used is an inaccurate assumption.

Secondly, the actions are being moved from the context menu to the ribbon. Most new computer users find it very hard to remember additional, non intuitive actions like right clicking & context menus. Each of these is a 'modifier' that power users are used to, but which make the mental model of file manipulation much harder for beginners to wrap their heads around. They have to remember to apply these modifiers to see if the functions they want exist. Moving the functions into a contextually aware ribbon will make life much easier for these users.

Third, Move, Copy, Delete & Rename occupy the center of the ribbon. These are the most used commands (by far) and rightfully occupy center stage. Power users will call it clutter, but it will be extremely helpful for beginners.

[Disclaimer: MSFT Employee, but I do not work on Windows]