I think this is actually because real, fluent literacy is still rare even in highly developed places. It may be easier for a very literate someone to dash off t

I think this is actually because real, fluent literacy is still rare even in highly developed places. It may be easier for a very literate someone to dash off those instructions but most people are 1000x more comfortable making a little video. Same goes for reading vs watching the video. This is my same theory about meetings being universally preferred to asynchronous email, even when literally all the questions someone asks at a meeting have already been answered in my long form email. Most people, even if they can read, are not really comfortable with it. Doubly so for writing. There used to be no choice to function in society, but increasingly we can use technology to substitute for reading and writing effectively, so people do.