It was created by Lauren Schmidt Hissrich and is based on a novel named The Witcher which was written by Andrzej Sapkowski.
At the same time, it had to make sure to capture audiences' attention right away or otherwise risk losing interest for future seasons.
Geralt is tasked with training Ciri to control her magical powers while also protecting her from forces out to get her.
I don't know why and I can't really make sense of it but I'd accept it instantly if that means we'll be seeing her decimating the ranks of the Nilfgaardians with her elven magic and be it just for a tiny moment.