Also in the industry. My bet is on all of them. Some people prefer block based, some prefer text, some prefer Markdown, some don't care. Writing a book on Notion is impossible for now, but building beautiful pages is much easier in Notion.
Microsoft and Google (And Atlassian) have all adopted the same strategy which is "Look more like Notion".
I don't think that Microsoft should be worried about Notion. But things are different with Google Docs, which is really threaten by Notion. At the end of the day, most Google docs can be created in Notion without any difference, and I actually doubt Google docs will be able to evolve enough to prevent that.
The strongest advantage of Notion compared to Google docs is not its text editor but it is his list feature. And there are a lot of list porn people. When you have 10% of your workforce being "hardcore list porn people" and 90% of the others being "dont care people". Then it makes sense that the full organization goes closer and closer to Notion
EDIT: "porn list" -> "list porn"