Yeah, different people need different things out of their phones. Yet the point remains that stingy data plans still exist in developed countries. Even though people may have better devices than those mentioned in the article (it is easier to justify a one-time expense than a recurring one), there are people who are stuck with them for various reasons. Affordability is definitely one of the reasons.
Even so, we should avoid pigeonholing those who have limited access to data as poor people. There are other reasons.
I never used it. I don't do a lot. WiFi at home, drive to work, WiFi at work, drive to home.
Travelling with the kids I've found the new plan makes life easier.