I disagree. Children need role models to know what being a good person is. But if they are boys, they would grow up to be men regardless of rolemodels. Maybe they won't fit your idea of what a man is, but they would be men. And their version would be as valid as yours. This idea that "being a man" is something both natural but that needs to be learned is weird. Or that there is only one right way to be "a man" when in fact people is different and there is nothing wrong with that.

Each person need to do some "self discovery" but for that, what they need is just good people and space to experiment and grow. Children don't need others to tell them "how to be a man" or "a woman", they would just grow up to be one.