Sure, but a lot of companies have switched. My previous job was a banking company with thousands of employees and they were using Google's suite for everything. So while Office is still ahead for serious work, there are more and more large companies out there who have migrated away.

From what I see when I step in to help various organisations improve I'd argue the opposite. Google docs improves coordination, which is the largest real cost of using ms office. To the point where most orgs have structured their whole operation around _how_ they are used to using ms office, with it's limitations. Stepping away from ms office allows concurrent distributed work, which radically improves efficiency.

google docs is a low friction entry into modern work coordination. It's not what I recommend for heavy work. But for heavy work ms office fails as well, just a little bit later, and with more costly result.

This "actual serious work" you mention is not what most people use Office for anyway.

Most people write simple letters, and do very basic spreadsheets.

This is probably one of those "80% of the people use 20% of the features" scenario.