I think a major flaw of the body positivity movement is just flat out asserting that XYZ feature is not realistic and in real life it only looks like ABC, or saying things like grown women have ABC and children have XYZ or whatever
Like yes actually there are grown women in a size 000 and there are women with natural DDDs who are otherwise super skinny. We don't have to treat XYZ as being unreal and unattainable and unwanted to create more acceptance for ABC