It isn't. 20% body fat is 6% below average. That isn't "merely overweight", it's likely underweight. No, I don't think underweight people should take appetite suppressants and I don't think that qualifies as a hot take. I think anyone who is medically overweight (which is a very modest BMI qualifier for anyone with any amount of muscle) should have the choice. Many US medical systems and insurers agree, which is a good place to be.