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There's also the part I don't think gets talked about enough in the whole thing of being overweight, which is being generally healthy. Although not being overweight is overall healthier than being overweight (though what constitutes overweight isn't the same for every person anyway), it's not as if being thin automatically means you are "healthy" now. There is still the question of what you are consuming; some people can eat more junk than others and still be thin, whether it's because of metabolism or because their overall calorie intake is still lower. And like you touched on with sedentary lifestyle, being thin doesn't mean you are fit. You can be thin from calorie intake and still be getting a poor amount of exercise, not stretching, having poor posture, etc. And then of course some people take being thin too far as well, to an unhealthy weight in the other direction.

So it's not just a problem of the design of things working against being a healthy weight. There's also an overemphasis on weight alone as some kind of intrinsic badge of health.