idk there's something cool that King Dad told Luz she wasn't chosen, wasn't unique, wasn't special, but was "here", and "a good witch".
it's way better than any number of stories where the apparently ordinary hero ends up having some grand destiny or heritage or something that completely negates the fact they were originally supposed to be ordinary
and it's even better, because the story has built up the fact that her learning glyphs has been something the boiling isles themselves have been actively enabling, eventually culminating as clear evidence King Dad has, ever since he gave her the tools to protect King from Eda's owl form, been teaching her magic, not because she has a grand destiny, not because she is special in a way that makes magic easy for her, but because she was "there" and was "a good witch"
and it's a great foil to philip who believed he had a greater destiny, as the only available tool to achieve God's will in the demon realm, that she came to understand she had no destiny, wasn't truly special, and even DOUBTED if she was better than him at all.
Humility. Open-mindedness. Kindness.
It's nice to have a story where those are the only strengths a protagonist brings to her arc, where there's no secret heritage, no eleventh-hour superpower waiting to manifest itself.
