The truth is chess performance depends tremendously on training, practice and number of games played. At my first job as a software developer they had an internal chess championship which I joined expecting to be beaten badly (there were programmers who were participating afterall), even though I spent most of the previous summer playing chess in the local park. I won that championship, positioning myself as a "smart guy" within the company. I don't think I was actually smarter than them. I barely had more exercise.
I think that these chess variants can cancel most of the training one has and level the playing field, making that chess game a brain game again.