Based on customer feedback, we should implement styles in the ribbon, say a class name, that when applied will truncate the titles of ribbon groups. Though by specification a group title should be short, that's not always possible. Having those styles will allow customers to have the groups being sized according to their content and not the greater of maximum of the content or group title
It would be great if long ribbon group titles were only truncated when the width of the browser window is insufficient to display the full title. (The solution should also behave reasonable when the ribbon groups are fully collapsed!)