You are correct that wind has a lot more flexibility in this area than nuclear. It is also much easier to scale a project up by just adding more turbines. In the case of older, smaller turbines they can be replaced with more modern turbines that yield more power (called re-powering).
In general wind power and solar have much better economies of scale too -- the more you build, the cheaper it gets. Nuclear doesn't tend to follow that pattern -- although there are attempts to create it via small modular reactors (SMRS). The jury is out if that will succeed or not (early signs are not great though).