I haven't been on iOS for years but I had a first gen watch, aside from glancing at my wrist when driving or doing something with my hands to see what a text message said, I couldn't see any practical use for the watch, which is why I ended up selling it after 5-6 months. I did use it a couple of times to take a call when I was doing garden work and didn't want to fish my dirt-covered hand into my pocket but obviously that was a subpar experience and not something you'd likely do often.

I love the idea of devices like this but if it's something that requires you to look at, and manipulate things on, the screen... I'd rather just use my phone. I imagine many people buy them purely as a "hey look at me, I gots me an Apple watch!" and some people might buy them so they can glance at their watch (pretending no one notices) to check incoming text messages in environments where it would be rude or not allowed to pop out their phone, but from my own experience I just can't see them being practical enough to really have enough interest to spur development aside from "here's the most important data from our app mirrored on your wrist!"