We started out by writing text, then went on to recording video/speech, only to realize that text was superior in the first place.
I get the value of videos for introducing new topics to beginners, but apart from the very early stages, i much prefer written information. I can search written information in a way that until very recently has not been possible with video/audio.
And also, my life is too short to view a 45 minute video on something i could probably read and understand in 10 minutes, without the obligatory introduction/self promotion/conclusion typically found in the video.