With this step, Microsoft would like to make it easier for users to work with the Office software through a tidier design, and to simplify the sometimes cluttered menu navigation. The focus should always be on the current work to be carried out. That this redesign is not just a visual gimmick for Microsoft, but really about improving the workflow with the office software is also noticeable because there is still no fixed date for the implementation with which everything is changed in one go becomes.
Rather, it is a project that is designed to be implemented in the long term. While some changes have already been tested, others are still in the testing phase to see whether changes really bring added value to users here, or only confuse them in the end. So it will take a while before all users will receive the new design. We think that (if Microsoft stays true to its cycle) the new design will be available to all users with the Office 2022 version at the latest.