Where are these conversations happening? I could see a lot of enterprise-focused groups potentially getting behind OnlyOffice, but individual home users? Not so much.
EDIT: My mistake! I didn't realize that there are standalone versions of OnlyOffice in addition to the web app version.
I apologize, because between OP's post and looking at the OnlyOffice website, I got the impression that it was only a web app, requiring a web server to run. After reading another comment here I looked harder on the website and found the download links for the standalone versions.