tbh as much as I’d love to tell myself it isn’t - and I use my iOS (and now WatchOS) dev career to justify it - but the Apple Watch kind of fits neatly for me in this would-be category. It’s more cool and interesting than it is functional.
For the watch both the fitness and activity features and being able to get all my notifications on my wrist are great features. A few other things (like having my 2FA codes easily accessible and controlling music) are also nice
I'm right with you on the fitness bit, there. Having GPS for all of my runs is fantastic, and you don't have to carry around your whole phone. Music is also nice, especially if you have it on the local storage.