Rexlion, I have this hitch for no particular deep reason, it just always worked for me and it's simple and easy to deal with. I also wonder about built in sway under conditions where it's better to have no sway control.
I may not have all of the science down to perfection, some of the of technical terminology could very well be incorrect and my understanding of sway verses whatever condition it should be called, the end result is the same. This trailer and the ones before it and most people I travel with experience the same effects from time to time. I really find it hard to believe we could all be wrong all the time.