The "person" is me. It's ok to tag me, by the way. If you want a discussion, that is.
While there are no rigid definitions (which is true for any genre, but more so with sandbox), sandbox games have some defining features and gameplay patterns that Legend decidedly lacks at least right now, and so anyone expecting those will not find any them here, repeating for emphasis, right now. We could go over the list of these patterns if someone's interested. So this isn't about a certain % or absolute amount of content being available in the first version, but rather some mechanics being at least somewhat functional.