Probably everything. Magsafe uses a form of the USB-PD protocol. The new one uses the latest version, supports higher voltages, and much higher total wattage. Probably easier to redesign the connector then try to make it compatible with a connector that has not been used in a shipping laptop for the last 6 years.I just want to see an ifixit teardown of the new MagSafe so we can learn what was wrong with the old MagSafe.
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