There is no one optimal weight for everyone. We should never let fashion pressure everyone to strive for an allegedly ideal weight, whether fat or thin, which is supposedly the same for everyone. Each person has their own ideal weight, and any standardized ideal weight will be unhealthy for most people.

however, just because we all have different optimal weights, that does not imply that each person has reached their optimal weight. As you say, it’s nobody’s business what somebody else’s optimal weight is. But each person needs to maintain a clear body awareness so they can determine for themselves what their ideal body weight is, then strive for that. don’t let the advertisers cloud your awareness with images that are wrong for your health and happiness. and conversely, don’t kid yourself into thinking you are perfect just the way you are, if your weight level is bad for your health.