Most users dislike the Ribbon menu. When I've setup systems for people, and family, and they requested "word" they are expecting this [0]. When they see the ribon menu they feel "I don't want to learn this, I already know word, this isn't word". The average user also doesn't open or change anythign in a browser. All they do is type into google. None the less they dislike those changes too. Cohesion is the most important thing in an enviroment.
Oh sure, but those are still 3 different menu styles for Windows. I have never tried the ribbon thing but I think I wouldn't like it as a casual libreoffice user.
[0] - https://i-technet.sec.s-msft.com/dynimg/IC354367.jpg