The end result and each chunk's end result is often a static picture. This is easy to do. None of these present problems. However, the Watch Me Build has proven very difficult until recently. To train students in a software application, it is most effective to show the process.
Static images are a poor substitute.
Doing this is possible for a WBT, but it is an enormous project. In addition, the images are lacking and the file size is simply too large. Students would have to download the movie, then watch it. Neither option smoothly integrates enough to be viable. This combination of time and motion offered great hope.