I might be biased since I learned to climb before YouTube, but I find it quite difficult to learn or teach others through coaching or watching. Although I don't think that holds for the basics, if someone doesn't know what a drop knee is then a video of one would be helpful.
But past that, so much depends on subtle weight shifts and tailoring moves to ones specific body; it's hard to learn that stuff outside of just trying hard moves yourself and making small adjustments.
But past that, so much depends on subtle weight shifts and tailoring moves to ones specific body; it's hard to learn that stuff outside of just trying hard moves yourself and making small adjustments.