Earlier quoted context omitted.
Imagine doing this with non-ChromeOS desktop Linux and every kid has a different DE, distro, maybe even window system installed lol
And they all have Firefox and LibreOffice Calc installed, so you can teach them how to use a web browser and a spreadsheet in an OS-agnostic (and DE/distro/WM-agnostic) way.
I don't think the schools are worried so much about not knowing how to teach students to use a word processor, but rather their IT staff not being able to maintain the equipment and set things up properly.
Kids will learn how to use basically any software easily, they are sponges. The poor admin that has to deal with all the lost machine and device enrollment, and password resets and OS upgrades borking stuff, they are the ones who schools are optimizing for.