It is too simplistic - the human body has all sorts of hystereses in it, and doesn't work on a linear scale with calories. That being said, improving diet and using appropriate quantities is a fairly common solution - if people can stick to it, they'll generally be better off.

If you eat less than you burn, you will lose weight.

The tricky part is in making it easier to eat less than you burn.

Eating healthier food that better sates you inside some kind of structure will help you accomplish that.

Our product will solve all of those problems as well as take the pain out of meal planning even for people not trying to necessarily lose weight.

I'm 100% serious, the deviation between the highest and lowest metabolisms save for people with specific conditions like hypothyroidism is not a significant contributor to obesity.

What about insulin sensitivity and different sources of calories. Surely you aren't suggesting that eating a 1k calories of pure protein, pure carbs or pure fat is the same ? Even proiten/carbs/fat branch and have different effects on the metabolism and are required in different amounts for a balanced diet to achieve some desired effect. What about muscle mass vs fat tissue, they burn calories at different rates and require different kind of food to build.

Calories in/out is just extreme oversimplification that doesn't help in the slightest and causes people to starve themselves needlessly because of bad intuition, also risking their health and ultimately achieving the opposite of the desired effect.

Much of that is addressed here:

http://news.ycombinator.com/item?id=3723464

Our product accounts for a great deal of factors, don't conflate my over-simplistic agreement with the OP for a lack of dedicated research into how we actually plan to help others.

Macronutrients and their impact on satiety are core to our product and to helping people eat healthier.