The usual thing with patents registered by Apple is to make it clear that it does not mean that it is something that we are going to see in the brand's products, it is simply something that they have in their possession and that they will use or not depending on many factors. In this case we are talking about reducing the thickness of the Apple Watch thanks to what is shown in this patent registered by the guys from Cupertino in which a watch strap is shown that would provide you with haptic feedback leaving more space inside the watch and reducing its size or thickness.
The registered patent clearly says that it is a mechanism that goes on the watch strap providing the touches or vibrations that we receive when a notification arrives, in this case the patent clearly says that it is a “mechanism attached to the strap with response haptic ”. In current models there are a good number of compatible straps but those that added a camera or some kind of extra "accessory" to the watch. were quickly ruled out due to the lack of an external connection port or similar even though it has one for the diagnosis right where the straps are inserted.
The Apple watch has a pretty good size in general lines, but if they were able from Cupertino to reduce the thickness of it without losing battery capacity or reducing the performance that the current model already has, many users would appreciate it. In addition, this registered patent would open the doors to these possible accessories in the straps, but as we mentioned at the beginning this could simply be one more Apple patent without being used in its products.