I'm happy without it now. Found a way to make it look even more slimmed down as the ribbon can be hidden unless used. So all you see is 1 slim menu at the top.
Copy into a text file and save as whateveryouwanttocallit.bat then right-click on the .bat and run as admin. Attached now mate, download and extract the .bat file. Remember you may need to start the Office apps twice to get the new Fluent UI.
Applied registry keys but UI is still the same in Excel, PowerPoint and Word. 0365ProPlus v 2109 14430.20270 Activated via KMS_VL_ALL_AIO in Manual Mode and then applied .bat and started Office apps several times but design is the same.
That's odd because before you accused us of being like children with a new toy you then decided that you didn't care about it and you weren't bothered anyway, but now you're posting about the new Fluent UI. That is the Fluent UI, flip it into system mode and you'll see.
Fluent UI isn't the square edges, isn't that to do with a graphics driver in Win 11? No idea, post a screenshot of the ribbon in Word.