They've set Qiyana up to grow.

From her bio, Qiyana seems like a wholly unlikable character. She's an immature child with an inferiority complex, intensified by the fact she has more talent than her siblings. And having grown up in a completely sheltered, xenophobic culture has left her with the false impression that she is the most powerful mage who ever lived. But she's just a big fish in a little pond.

From the sounds of it, her story is going to be mainly confined to interactions with Piltover's miners. Which is a fantastic way to feed her ego even more. They could come back again and again with inadequate bodyguards, bolstering her up until one of the champions who could actually take her on decides to show up and destroy her entire worldview. Camille would be a good fit for the part, and it could quite easily fit that the mines belong to her family. They could be mining for the raw materials that make up their synthetic hextech crystals.

But that's only scratching the surface. Nevermind someone without magic standing toe to toe with her thanks to advanced technology, if she or her people get involved in the greater threats that threaten the entire planet, then she's going to learn real fast that there are far more powerful magics at work in the world than hers. Hell, there's also the opportunity to put her up against characters with better control over single elements like Yasuo, Janna, Nami, or Taliyah. There's so much room for her to grow, and to eventually cure her of the debilitating lack of self-worth she grew into. I'm actually excited to see what they can do with her.