[taneq]

The lecture format has only been competing with high-production-values video for a decade or two, and with interactive examples for much less than that.

[BlueTemplar]

Interactive examples using Macromedia Flash or Java applets are straight in the "a decade or two" time frame.

(The 3B1B one is of course also among the best :

https://eater.net/quaternions )

And, while it was before my time, universities might have had some before the World Wide Web ?

Video has been around for much longer than that too.

I'm also not sure why "high production values" is supposed to matter, aren't Feynman's video lectures good enough for you ?