Believe it or not I think there is a simple explanation. Magnetic orientation decides what chargers work with what watches.
About two months ago there was a Reddit post about someone who forgot and wore their Apple watch during an MRI scan.
When they tried charging their watch on their Apple charging puck they could not get it attached, the magnet embedded within the watch had its polarity reversed. The end result was the Apple watch could physically adapt to a Samsung charger but it still wouldn’t charge, probably because it had different voltage levels or it was damaged by the MRI.
So, in the long run, magnetic orientation of the charging pucks are partially responsible with how it determines if a certain puck will work with a particular device. Apple uses one orientation and everyone else is allowed to use the other orientation. This was probably hammered out in a 4,000 page trademark document that Apple would use a particular magnetic alignment and everyone else can use the other.
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