User blog comment:Hidden Scorpius XI/My Impressions on "Beginning of the End." Take-two (V3-E7)/@comment-26397825-20160105023150

They explained that Maidens had the ability to do things without Dust in the episode that explained the Maidens. I think it stands to reason that that means they can summon all the elements without Dust. It doesn't make them OP, it just makes them use less resources to do things others can do.

OP would be if they started having proper spells, like a sleep spell or a transfiguration spell to turn a person into an animal or something. Elemental control like the Avatar is not really that OP when you think about it.

Anyone can use all the elements. It's just that the Maidens don't need Dust to do so.