I think you are confusing the nutrient need (or not) for carbs and a dietary need for the fibre contained in the carbs.
As far as we know, as of right now, carbs do not contain any nutrients our bodies cannot get from elsewhere. We agree.
However, the make up of the carbohydrates regarding digestive transit issues and the need for fibre may be essential for some of us, including me. I may be an outlier, but i am still a person to be counted as one who needs complex carbs in my diet on a daily basis to avoid further damage to my body due to certain medical conditions.
I know, from other posters on this forum, that I am not the only one in this position.