Haha, yeah. They have such splendid examples of more mature magical girls in Rin and Luvia: Those two spend 90% of time warring so fiercely with each other that even the staves left them. Who knows, Miyu, being so overserious, might have interpreted the relationship between those two so that magical girls are always meant to compete with each other aggressively, never cooperate and be friends unless their very lives are in danger.