I was stuck on Bernstein's 6-12-12 for a long time which meant that I was stuck on 30 total carbs a day, not net carbs, so even changing from total carbs to net carbs felt at first like sacrilege. What really opened my mind to greater flexibility was learning about prioritizing protein. Certainly eating 6-12-12 really helped me lose weight and get some routine into my eating but prioritizing protein helped me lose the rigidity in my carb intake (along with my belief that the more fat the better). I think the problem comes in when we treat our eating principles like religion where any deviation from the plan is sacrilege. If we can keep our minds open to new information and pay attention to both what makes logical sense and what gets us the results we want, we can function as intelligent human beings and not members of a cult.