Good article, but the comments on Office are slightly out of date 🙂 Whilst many teachers think of (and still use) Office in the way you describe, since the release of Office 2016 last year you are able to use it online and offline in the same way as Google Docs, etc, including real-time collaboration online and offline . Teachers and students also often have access to Office in Education free.
I use it with the same documents on my work notebook, home desktop and phone, as well as collaborating with colleagues in real-time on planning documents.
Whilst I have no issue with Google Docs,etc, I find being able to work on things offline and automatically syncing when back online is really useful, and the MS tools still have more features than the Google products, as well as most teachers being familiar with it and therefore easier for them to transition to a more modern workflow.