This may be true, but this statement is also missing the (possibly large?) group of people that simply have no benchmark in their mind for how much sugar is acceptable.

I've read several competing articles about daily limits to added sugar, and the number I have in my mind is 80g/day max. Given that a teaspoon of sugar is roughly 4g, this amounts to 20 teaspoons of sugar per day! I've wondered if nutrition labels listing sugar in terms of teaspoons instead of grams would help people visualize exactly how much sugar they are consuming.

I would agree that those who care about sugar intake probably will avoid Milky Ways, but I'm also concerned that if we don't have a % DV on sugar, people will perhaps assume that there is no ceiling. Why do we have % DV for fat, carbs, etc., but not sugar? Hmm, well maybe it's that no amount of sugar you eat today will harm you.

As a curious experiment, walk down the street and randomly survey people for how many grams of sugar they think they should limit themselves to.