For many in younger generations (including myself), watching a youtube video - even a dry educational one - scratches an "I'm being entertained" itch, perhaps born of being raised watching television. Something deeply rooted adores fast-paced audiovisual stimuli. Reading a well written document does not have the same effect. It's troubling.

I prefer to read to learn, overall, but I really like that a video of someone doing the thing I want to learn will communicate their assumptions and less tangible knowledge via their actions.

They can be but I'd agree documents are usually better for in depth knowledge. Seeing a demonstration really helps me get started.