The Apple Watch App should communicate through the web-api with the nuki-devices.
Actually the Apple Watch App uses bluetooth to communicate with the opener or smart-lock, if the iphone is not reachable.
That is rather useless when using an opener, because it often is not reachable through bluetooth.
The Apple Watch models with Cellular should better use the web-api to communicate with the locks.
The Opener cannot be controlled with the Apple Watch App if the iPhone is connected.
I want to go out and take only my apple watch (with cellular) with me (and no keys).