At least to me, it seems most regular users would struggle and have their productivity reduced attempting to learn a new word processing UI. Everyone and their extended family has been trained on Microsoft products, with Microsoft UI design.
I think this matters for the paying customers of things like Collabora and LibreOffice, as they're using it in a work environment. Not at home.
I agree - we're coming up on 20 years of the ribbon, it is too jarring to go back to the fixed toolbars and the vast majority of computer users have no experience with the "old way."
> most regular users would...have their productivity reduced...this matters for the paying customers...using it in a work environment
If the concern is business productivity, then it might be interesting to read that at least some research indicates (perhaps counterintuitively to some) that classic style is better:
"...results indicate that Excel 2003 is significantly superior to Excel 2007 in all the dependent variables...results support the conclusion that the user interface of Excel 2007 did change for the worst in comparison with the user interface of the 2003 version." [0]
[0] Morales (2010), A COMPARATIVE USABILITY STUDY OF MICROSOFT OFFICE 2007 AND MICROSOFT OFFICE 2003, https://scholar7-dev.uprm.edu/server/api/core/bitstreams/a03...