So, why is it that as a wealthy person with good health insurance and access to care, when I see my GP for an actual physical, I get weighed, but I don't get a

So, why is it that as a wealthy person with good health insurance and access to care, when I see my GP for an actual physical, I get weighed, but I don't get a DEXA scan that actually measures muscle and fat? They're not expensive compared to other stuff in health care, but accurate fat measurement seems to be a thing for recreational fitness nerds not people trying to live a long time or without chronic diseases? When I've gotten these before it's always from a scanner in truck in a CrossFit parking lot rather than at a Dr office. If distinguishing between fat and weight is important, why is it so ignored in medical contexts?