"De facto ally of Microsoft" - LibreOffice Weighs In on Euro-Office and EU Digital Sovereignty
(blog.documentfoundation.org)
No one has done that because no single person can do that by themselves.
I've participated in technical migrations of large organizations full of non-technical, unmotivated users. It sucks regardless.
And we can't just keep lowering our expectations re: people interacting with technology. Desktop computers, office suites, and file formats are concepts that came into the non-techie consciousness 20 years ago now. The people who refuse to use an extra 5 brain cells to try to understand this stuff should not be the baseline we cater to.