The school is not giving you the role you want, but the role you need. That's all.
That's an idea, but does Hanako (or anyone) "need" to be a seductress?
This is a series about an all girls school being uploaded to dynasty, so clearly.
Though more seriously, having people who can act outside established social dynamics and norms actually is helpful, as otherwise people can become shackled by them or fail to understand how they're limiting their conception of what's possible.
This doesn't mean being a seductress per se (and I think her role is more general than that), but some stereotypical traits of one could be positive in some situations with some people.