[lotsofpulp]

>It could be that that the SMS experience is the reason when it comes to adults who are mature enough to leave the green/blue behind them but have a lot less tolerance for poor UX.

From poor country to rich country, I have never met teens who are less tech savvy than adults. If anything, adults have problems even understanding the difference between SMS, MMS, and other messaging protocols. Teens are the ones using the new features from iMessages, not most adults.