In my case, I use it like a way of reduce my screen-time and phone addiction. It is working pretty good for me.
Since I have an Apple Watch, I can just spend my day outside without worrying of having my iPhone. If I need to communicate I can do it, but I don't have a permanent distractive tool.
That's it. I just want it because I can be more flexible with my phone usage.
I love the possibility of getting away of the phone and screen addiction. I usually go outside just with my LTE Apple Watch. Lifechanger for me.