What is the value of a gluten-free diet for people who don't have celiac disease?

No real value: People who have no allergy to gluten don't benefit from a gluten-free diet. Gluten-free foods use grains such as corn and sorghum that don't have gluten, but such foods are more expensive and harder to find. Healthy gluten-free foods are fine for anyone to eat, as long as they are part of a balanced diet.

Less leaky gut: Gluten tends to increase gut permeability, which is bad. It does this in everyone, not just those who are celiac. Wheat is also sprayed with round-up, and not eating it means less toxic exposure.