I think the main use case is activity tracking. If you already have an activity tracking watch and it breaks, hey an Apple Watch let’s you activity tracking and maybe vibrates during navigation so you don’t miss your turn. But I have never seen much use past that.

Currently rocking a garmin 735 for activity tracking / run gps. When it breaks maybe I will get an Apple Watch? Or maybe a newer garmin. Nothing else the Apple Watch does really interests me. Also my watch goes 7-10 days between charges.