I like to scan articles quickly for keywords/key phrases/diagrams/code snippets. I'm often put off when something is in video for simply because this is not easy to do. Together with the sound issue in my other comment, this means that I often end up never watching videos that provide content I would otherwise have enjoyed or found useful.

Am I the one missing out? Probably, but I also pass a lot of content that I do like around to lots of people, so the authors also lose out on a potential fanbase/readership/whatever.