Why do we need to use the term cis for gender?

I understand the meaning of cis but we do not use this term for anything else? I have never heard anyone ask for cis Coke as opposed to Diet Coke, or cis sausage as opposed to vegetarian sausage, because we have historically used a term to define the standard and only distinguish the none standard.

Why do we need to use the term cis for gender?
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