@rey Not agreeing.
We have smartphones, now, technology made it far easier to make videos. Knowledge isn't teached in every courses like writing isn't (I speak of writing like how to structurate your thoughts and stuff)
Saying that the alternative to video is text isn't true at all, it's a different medium, different language.
Plus, text can be a no-go for someone who doesn't have the energy to focus and read whereas video can allow you to get some stuff if it's done correctly (edited, I mean, not just doing a lecture in front of a camera, that's where the language part comes in)
It's accessible in means (or almost, depending on the situation), but not forcefully in knowledge
In my own context text is usually more accessible because of the constraints of listening to audio in public (I don't always want others to hear what I'm seeing or be loud in public). That and I can read fairly well
But I can appreciate where others might be the exact opposite situation
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