What's the point of the 90 on 90 videos?

I don't get the point of the 90 on 90 videos. For readers of the site they contain no new information. They're just a rehash of content we've already seen.

If these videos are meant for the drive-by casual viewer, there's going to be far too many of them. A casual viewer isn't going to be interested in watching tons of these brief videos.