Let's use the less emotionally charged example of the gym rat.
An individual who sets out with the goal and drive to become substantially physically stronger can be successful with high probability.
But not everyone will do that. Most will give up or just not even bother in the first place. Lots of people don't even care, despite it being almost strictly superior.
It would be logically incorrect to use that fact in order to argue that muscle mass is likely to be unchangeable. It is changeable, it's just not the path of least resistance.
edit: or, to put it succinctly - prevalence is not probability
Let's use the less emotionally charged example of the gym rat.
An individual who sets out with the goal and drive to become substantially physically stronger can be successful with high probability.
But not everyone will do that. Most will give up or just not even bother in the first place. Lots of people don't even care, despite it being almost strictly superior.
It would be logically incorrect to use that fact in order to argue that muscle mass is likely to be unchangeable. It is changeable, it's just not the path of least resistance.
edit: or, to put it succinctly - prevalence is not probability