^Why couldn't they do both? The point is, it's their choice now. They're free to develop their culture as they wish. No culture is fixed and stagnant. Every culture evolves, grows, diversifies. They've got a whole planet to themselves, except for the irradiated part. Their options are not exactly constrained. As their population grows, it could branch out into a number of different cultures with different lifestyles, descended from the Novan culture that NX-01 met but not identical to it.