I agree with one exception, and that is addiction. 

For some of us it is easier to just say no than to fight the problems with cravings. Keeping it down to 20 basically eliminates all processed foods (because all have carbs to make them taste like something) and any sugary treats. For me it is easier to do that than fight cravings that the occasional higher carb treat will cause.

I would have never said I was addicted to food. But looking back at pre-low carb days I am absolutely sure I was. The hardest craving I had to get rid of wasn't even carbs but the sweet taste of diet soda. That sweet taste is what kept me craving other sweets. Once I finally got rid of that the cravings went away.

But you are right. 100 grams gives a much wider latitude of foods that can be included in a low carb diet (but not ketogenic - they are different). Which would suit many peoples needs very well.