@yvolk @clacke That's from the tutorial and afaict it's not incorrect, just simplified. Users are actors; left unsaid is that other things can be actors too. (It also didn't say users can't have multiple actors.) The reason it isn't said is to try to reduce the "asides" used in the overview/tutorial, which is trying to allow newcomers to become as familiar with concepts as fast as possible while remaining correct.

I believe this is "technically correct, which is the best kind of correct" ;)