I did this for two reasons. One, to practice more artistic and less vectored ponies. Partially because it's faster and partially because the greatest art I've seen requires a different skill than I have.
Second, I wanted to describe how each pony is really much more than they appear to be. That's why in most of these reports, I'm going to suggest that their true element is different than described.
I would say that RD showed two different classes of Sonic Rainboom. The stronger was when she was younger. Of course, after this study was written, she may have invented a new one: the Sonic Rainbomb. It's not really in the same scale though since it's a completely different move.