I never used the word "hard". I know that the arrow keys can be used to navigate the start menu (how else would I navigate the start menu using the keyboard? Which is clearly what I am talking about), but it has always been more keystrokes to get around the tree-menu than to get around Metro's homescreen.

Is 10 keystrokes instead of 5 keystrokes "hard"? Of course not. I'm not a paraplegic. Notice I used the word "convenient".