...while we have obviously different caloric needs depending on lbm and lifestyle the way our body works is the same.
To add a layer of complexity to this for consideration there is a saying (I don't recall where it came from):
"All healthy people are the same, all unhealthy people are unhealthy in their own way."
That is to say as long as we're healthy what you say is probably true but we all respond to stressors differently which can cause different parts of our bodies to break down in different ways thus requiring individualized solutions to each person.
"Eat as if your life depends on it!"