I didn’t know that the ministering angels don’t have a sense of individuality. Although if they don’t, I would have thought it would be because of their unimaginable self-negation to Hashem.
I do think that conformity is a great way to raise like-minded children. Being a poresh min haTzibbur is not a good thing.
I don’t think that a person loses his individuality by conforming to a dress code. I think this can be substantiated by a quick glance at 5 charedi people.
I guess the administration and parents of that school would disagree with your position.