Although it's also worth mentioning that, while what you say is true, most diets will not work for most people (statistically speaking, from studies). Focusing on calories in / calories out is less important, in my book, than finding a diet that will work for you, because most won't.
I would agree with that. I was kind of just trying to guess what I thought parent _might_ have thought based on some things I've heard a lot of people say about nutrition in recent years.