Online learning, yes. However, what is wrong with writing? Why this youtube mania for making videos of everything? Not everyone wants to listen to hours of videos of some guy droning on about something that they could have read in a few minutes, with random access ability to concentrate on the few bits that they don't know.
I am not saying that this guy does a bad job but, in general, I avoid videos like plague after many bad experiences with them. Especially those where there is just scrolling text and some god awful soundtrack with it.
Secondly, from what I can tell, writing is inferior to the human physical expression, which includes speech. It exists to mimic and preserve thought or speech. But it can never be precise, simply because the human body augments speech. When writing gets close to accurately doing that, it become verbose and tedious.
Or, to put it another way: Would your kids prefer to read or be read to? Would you prefer the lyrics or the song? The script or the movie? You might, most wouldn't.
Writing is not inferior when it hosts a subject being studied. To quote your example, yes, lyrics would be preferred to a song if the meaning is being studied, script would be prefered to movie if dialogues are being studied.
Atleast in the current context, books are faster to reread compared to rewinding a video, which can break your flow.
They're just different I guess.
Writing is easier to skim, I can scan a 1000 word article in a few seconds to tell if it's likely worth my time to read. I can't do that easily with a 10 minute video. It's also easier to edit.
OTOH speech conveys emotion better and feels like it has less mental overhead to consume and produce. I know a few people who are excellent speakers but very poor writers for example.
I am not saying that this guy does a bad job but, in general, I avoid videos like plague after many bad experiences with them. Especially those where there is just scrolling text and some god awful soundtrack with it.