Consider this.

Jane has an Apple Watch, she travels often and has a weather complication on her Watch Face. Jane took a plane from New-York to London. She just landed in London. 

Her watch changes the time automatically.

However, Jane has to go to her Apple Watch app on her iPhone and change the weather manually. 

This is cumbersome. 

Apple Watch should have a setting which would allow automatic detection and change of the weather complication based on the user’s current location.

(Not the biggest experience problem of the Apple Watch? It’s all about the details, man.)