>20 years ago all that stuff already existed.
Wrong, even today, Blackboard, which is the DS alternative, still does not do most of those things. Google promoted them over my application while they were still just a brochure and buried my live application, which was streaming video 24x7 commercial, 300 pages deep. Clowns. Do you understand that I was the one who revealed just about everything because I was dealing with them since the year before 911. I knew about the Department of Education back then and how they were useless and 100k people there doing absolutely nothing.