Anarcho-primitivism is a political ideology which rejects civilization and tells to live prehistoric Stone Age or Bronze Age lifestyle. It rejects everything associated with civilization including division of labor and technology. Although anarcho-primitivism is a form of anarchism, many proponents of anarchism criticized this ideology calling it impractical.
It's unclear how enough Food could be produced to keep the World's population alive if people returned to stone age or bronze age agriculture. Also our health would be far worse without modern medicine.
Some individuals may be happier living a primitive lifestyle, and those individuals have every right to do so. However, it should not be implemented in society at large.