Not everyone (perhaps most) don’t concern themselves with poor weather as they simply avoid it, but for me the #1 reason to get a Garmin watch vs. an Apple Watch or simply using my phone was cold weather. Below 30F/0C my phone would turn off in the middle of activities and using a touchscreen in the rain is an exercise in frustration.
So while being able to take calls and having access to most of the features of my phone on my wrist sounded convenient, it was a non-starter for me.