I thought it was on by default but I could be wrong. I use mine a few times a year but I don't recall seeing any SMS. Perhaps an onscreen message. But I haven't seen those for a long time, not lately. When I take it off Airplane mode the massage asks me if I want to enable data roaming but that is about it. AT&T has some new international roaming agreements in different countries where I think it goes into roaming automatically without any message if roaming is on.
It is about the quality of life. The upper management and high level employees don't want to live in the midwest. They want vistas of mountains and oceans, sailboats, fine dining, fancy country clubs, private schools, expensive boutiques and malls and they don't want to have to drive 6 hours to get the oil changed on their Bentley.