There is a good reason for not having videos: They give the impression of BLATANT DISREGARD for legalities--an attitude that the Nexus doesn't want to give the impression of promoting.
But those who say "there's no need for videos," or take similar positions, seem to be rationalizing. If you wanted to explain to a friend how to do an extraction, the natural tendency would be to SHOW them--invite them to watch as you did one and explained about it. ALL instruction/teaching is most naturally conducted by "showing," which is just "live video in person."
Making a video is just "giving a recipe?" No, WRITING A RECIPE DOWN is just giving a recipe. How many cooking TV shows and cooking videos are there? There are a gazillion cooking videos on youtube--for every style of cooking or cuisine you can imagine. On many google searches, one automatically finds a video on the results list. Personally, sometimes when I'm doing a search (on just about ANYTHING), I actually search YOUTUBE first, before even TRYING google!
If it weren't for the legal issues, we would have lots of videos of extractions (and vaporizing techniques--and anything else you can imagine), and no one would say they were anything but a normal expression of sharing ideas and methods. There's nothing wrong with videos--after person-to-person expression, they are the most direct way of sharing between people. Videos are what made Youtube an extraordinary internet success and phenomenon.