The trouble with that is that videos are much harder to reference than text. If someone slaps a [citation needed] on a claim I'm making, I may have to track down the video, find the right time stamp, and link that. And then they will probably say that YouTube isn't a valid source, even if it comes from a relatively reputable creator (I've had people say this for a Tom Scott video where he was interviewing a subject matter expert in the topic).

This is all so much easier with blogs. Even if people should be a little more skeptical of blogs, at least a blog can link its own sources more easily than YouTube to get to something more reputable.