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M series are bigger, more powerful and thus are harder to cool and use more power. They can do it in an iPad due to the larger surface area and bigger battery but not in the iPhone. The iPhone is better off with a chip that doesn't use as much battery, doesn't take up as much space on the board and doesn't burn your hands. The cheaper iPads will continue to use A series chips to differentiate between the Pro/non-Pro models.
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