That’s because the M1 processor comes from a mobile heritage that’s always been focused on efficiency. The fact that they started an architecture decades after

That’s because the M1 processor comes from a mobile heritage that’s always been focused on efficiency. The fact that they started an architecture decades after x86 allowed them to learn from its errors, remove its complexity and tune it for low energy usage. At least that’s my superficial understanding. There are probably good articles on that topic.