The main motivation seems to be elimination of social/media consumption. I typically only use the smartness for maps, Uber, HN, and the occasional puzzle game or youtube video when I'm killing time waiting. I was completely fine if I forgot my phone at home all day, back when I used to commute to the office. People who know me, know that I'm not 'always on' so it isn't a problem.

Another good reason could be for utmost privacy. Not perfect but I keep location services disabled except when I need to use it, then turn it off right after. I started doing that for battery life so I can go days without charging and it just became a normal habit.