"Cisgender-woman and proud of it."
I'm glad you are comfortable with it, that's your choice. Whatever works for you.
Here's the thing though, you cannot speak for the rest of us.
And actually your use of "cis gender" rather than just "cis" is quite useful. While you may believe in an innate internal gender, this does not mean that everyone does. Personally I don't.
So it's not possible for my inner gender to match my biological sex, therefore I don't see how "cis" makes any sense at all for me.
The other aspect to this is that when I think of gender, I think of it in terms of the social expectations placed on my sex. And as those expectations are largely in place in order to keep men at the top of the hierarchy I can safely say I do not "identify" with the gender associated with my sex. I do not "identify" as subservient, decorative or objectified - that I am treated this way is why I am angry and why I am a feminist.
Telling me that I have to accept a label that says I do identify with it is deeply offensive.
If "cis" merely meant that I didn't suffer gender dysphoria then I'd be more willing to accept it - though slightly confusedly as no other medical condition has a counter definition - but as TRA's are keen to point out, not every "trans" individual has GD.