The Apple Watch won't be getting any extra biometric security measures anytime soon, because it's an engineering nightmare. Like other Apple products, there are security measures in place on the Apple Watch to make sure only the owner can use it. However, while it is one of the few Apple products to not include biometric security, it's going to be that way for a long time. In a Monday post to Weibo , serial leaker Instant Digital denounces apparent rumors of Apple bringing some form of biometric security to the Apple Watch as pure speculation. To the leaker, Apple's current strategy is still focused on allowing users to unlock devices using a link to their iPhone. It has no intention for the moment of adding such a thing to the Apple Watch. Currently, the Apple Watch relies on users entering a PIN to unlock the device while on their wrist, or by using Touch ID on a linked iPhone. The Apple Watch remains unlocked while it detects it is still on the wearer's wrist, and automatically locks when it is removed.…