I am not so convinced: most staff do relatively basic stuff with MS365, right?
People don't like to even try something else, but when they have no choice, it doesn't take them 5 years to understand how to select text in one of the Microsoft Word competitors and click "bold".
No, they're frequently using things like track changes in Word docs and even small variants to that (why not use Confluence with comments instead so we stop emailing docs around?) encounter a lot of tissue rejection. And marketing want their template with the latest branding pushed to everyone's Word as a default template. And it should integrate nicely with Sharepoint. And and and.