But if you had the rings you wouldnt need to do the silly bolt tightening procedure of rotating the wheel 50x times and tightening each lug half a turn at a time to try and center the stupid wheel. And thus a lot of people who don't do that with aftermarket wheels and no hub-cnetric rings end up with steering shake bacuase of non alignment.
I never said it wasn't possiblle to not be able to center the wheels with your method. It's just not practical nor easily repeatable.