Furthermore, it reinforces the idea that the families that can use magic “deserve” their noble status because of their ability.

This was an idea I've seen frequently in anime that's kind of rubbed me the wrong way. Personally I wish they'd use the opportunity to reveal that despite having all these magical powers, they're actually inept or kind of dumb, but ultimately these families are also extremely cunning. It seems like the more powerful they are in magic, the smarter they also are. People might point to 'well they have to study to have their magical powers!', except that wouldn't really make them particularly intelligent; knowing how to cast a fireball is not the same as knowing how a machine works or how to navigate diplomatic affairs or how to outmaneuver an army.