So, by your reasoning, only those who practice whole body medicine are considered physicians. Then, brain surgeons, proctologists (colon and rectal surgeons), pathologists, urologists are not physicians. They are limited to certain body parts. What about ENT? they do not even treat anything lower than lungs. Ophthalmologists only treat eyes. They do not practice over whole body. Every specialty is limited to something. As far as education, both MD, DO, and DPM receive same first 2 years with minimal differences.
What about medical doctors that became scientists, CEO's, leaders, or went to politics? They are not physicians anymore? Based on your argument they do not practice whole body.