I am very much with entropicscholar, Aether, and Demandred on this. I think it's a very important piece of information that expands opportunities a vast amount, but it doesn't mean that everyone on every world can have any power they want if they just give it their best go and study real hard. I think it's totally feasible that someone on Roshar would have to posses the same/similar qualities as someone on Scardial to be a Mistborn versus a Misting, for example. I would assume that would have to do with the makeup of their sDNA.