[epgui]

This is already understood, it's not like scientists aren't aware.

The simplified concept of humans being one organism will continue to be taught nonetheless, because it's extremely useful, and not even wrong in most contexts in which it's applied.

There's nothing special about this, you can say the same thing about any simple model in biology: that the brain is an organ inside the head is a simplification, any diagram of a homeostatic system or metabolic pathway that fits on a single page is a simplification, the "central dogma" of DNA -> RNA -> protein is a simplification...

All of these things are well-known. They continue to be used as models, because, well... they're useful models. And there's nothing wrong with that!

[K0SM0S]

Even more generally, reductionism works but with known limitations which warrant a more holistic approach, and we can't work our way out of most real-world problems without this multi-layered approach. Welcome to empiricism in complex systems.