In order to charge wirelessly, you need to design both chargers and device to have coils that are carefully matched to transmit energy via magnetism.
While the Qi wireless charging standard existed at the time (I think) it is not suitable for watches.
So when Apple released the Apple Watch, they had to invent a way to charge it. They also made the shape very precise so that the charger and watch align and thus maximum charging efficiency can be achieved. wireless charging standard for it.
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