Thank you for this. I've heard little bits and pieces of it before, but I think you've done a great job of summarizing modern "computing" for the vast majority of people.
For a long time now, they don't want typed and printed assignments; in fact some of my instructors in primary school would actually look upon these suspiciously - the default assumption is that if you are printing it out you are trying to bypass the anti-plagiarism system. That's also partially why every assignment is turned in online: your writing is run through one or more anti-plagiarism systems (and saved for later use against yourself and others).
Nowadays the most common use for my printer at home is making Amazon return labels.