I agree with the importance of using (and knowing how to use) a map and compass. That said, I still bring an InReach on every backpacking trip, for a few reasons.
-- If I get truly lost, since I always have tracking on, I can follow 'breadcrumbs' backward to help 'find' myself.
-- If I get severely injured, I can not only call for help, but communicate with rescuers what kind of injury I have, how bad the injury is, whether they need to move fast or can take their time, etc.
-- Family members really enjoy following along via the website as I hike.