They are who they are, in their hands is only the decision to fight or to run away.

How is this not "choice"?

Simon made Nia able to accept herself as herself.

Where were we shown her conflict with "accepting herself"?

And "visuals" include the expressions of the cast members.

Which...negates nothing I said. If I can't connect to the reason Nia is frowning or looks melancholy, then it's just a nuanced picture.