SharePoint Online is a critical piece of the Microsoft 365 ecosystem. Its document management service is consumed by many apps like Teams, Yammer, and Planner. OneDrive for Business, the personal side of SharePoint Online, also contributes to SharePoint’s success with components like the synchronization client. Without SharePoint Online, Microsoft 365 would be a very different offering and a worse platform to work with.
BTW, if you're at the European SharePoint Conference (ESPC) in Copenhagen next week, I'm happy to debate this point in person...
https://office365itpros.com/2022/11/24/sharepoint-online-role/
