It's been a long time since I used Office, but what drove me nuts about the ribbon of that era (not sure if it's still a thing; hopefully not!) is that the "home" ribbon elements weren't replicated in their respective logical tabs (i.e. the home ribbon wasn't just a shortcut palette). Drove me nuts trying to find something when I didn't realize some designer at Microsoft thought the function I was looking for was "essential" and thus deserved to be enshrined in the home tab.