What's "quite" mean here? Is it necessary to put it there?

Native speaker’s answer
Rebecca
Here, "quite" means to a certain or significant degree. It's not really necessary since "so" functions similarly. But it does make the sentence a bit softer and polite, and less direct or harsh in its tone. Ex: I'm not quite sure what to do. = I'm not sure what to do. Ex: She's quite excited for the party.