The apple watch can use a 20w charger. Just place the magnetic fast charger to USB-C cable that comes with the watch on the back of the watch to connect to the power supply.
There is still a magnetic charging cable in the Apple Watch box, but Apple canceled the 5W power adapter, which is what we commonly call the charging head.
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There are rumors that Apple plans to cancel the power adapter for the new iPhone due to factors such as 5G costs and the environment. The removal of the power adapter for the new Apple Watch paved the way for the new iPhone.
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But today's new iPad Air still offers a power adapter, and it's a 20W USB-C power adapter. The eighth-generation iPad also comes with the same 20W power adapter, as well as a USB-C Lightning charging cable.