[That's good; she wasn't intending to be offensive, but sometimes she's admittedly just too blunt]
...Theoretically, everyone on Auldrant can manage the basic process of it. However, if you lack an amount of natural talent or genetics it can not-- go well if you try to do more. [Like burning out your own eyes, mutating every cell in your body so you end up horribly disfigured, ending up a mindless vegetable...] So not everyone relies on it, and instead on other weapons that can stand up to the monsters of the world.