Great article, but I think it's missing a key point, the failure of iPads (which the highlighted graph shows). Into that vacuum, Google stepped in with a cheap and simple Chromebook solution for both consuming and producing content that had minimal administrative overhead and training, and sold it very well.

https://www.nytimes.com/2017/05/13/technology/google-education-chromebooks-schools.html

Failure of iPads:

https://www.wired.com/2015/05/los-angeles-edtech/

Note also that Microsoft is flat in this graph, Apple down since 2013, and Google skyrockets.
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