I also take it with me on vehicle trips (auto and motorcycle)...there are plenty of places on normal paved roads in western America where there's no cell coverage. You could have an accident, come across somebody who's been in one and injured, or need a tow truck for a breakdown, and you can use the InReach to call for help.
My most common use is to let my wife know I'm staying longer because the fish are hitting, or I'm heading to a different lake than originally intended. It's an incredibly useful communication device!
Regarding satellite communication....I suspect we'll hear some tough guy malarkey from people who'll say if they get hurt or have a heart attack and die in the wild that's where they want to be. Well it ain't all about you...your survivors and S&R could be saved a lot of heartache and effort if they knew exactly to where to find your carcass.