Earlier quoted context omitted.
Libre Office is fine standalone but as soon as you have to exchange files with other businesses you are often pretty much forced to use MS Office. Sad but true.
Most use PDF for exchanges anyway, as there is no guarantee the receiver system has all the document components/features used to author content. 10% of users with MacOS Office 2019 installs just got NERF'd by Microsoft. This story will not encourage users to spend more money on a disappearing rabbit trick. =3
It does not even have to be in a web UI or browser. Just somehow make it possible to easily connect and edit collaboratively. I know, I know, it is a huge ask, unfortunately.