I think the point is that he wants all of the content to be presented together, which includes a mix of photos and videos. Even if it were just videos, a batch

I think the point is that he wants all of the content to be presented together, which includes a mix of photos and videos. Even if it were just videos, a batch of content could not be presented together (easily) via youtube, since videos are basically standalone (with the exception of playlists, which removes a lot of desired simplicity).