Terrible terrible software design. 
Customizing the Quick Access Menu gives you a list of menu items, but you can't filter them, or search through them for the one you want, so you have to scroll through a list of around 100 commands to find the onw you want?  I looked for what was previously Insert -> New Comment. 
For business documents, I see this used all the time. It's not on the ribbon, and it's not in the customize list... so where is it?  In the end, I had to download a free 3rd party app that restores the old menu.  Now I have access to everything I want again, and the ribbon is just useless fluff that I keep hidden and never use.