@ngocnguyen:
Your criticisms makes total sense for probably 80% users out there (wild guess). But iPhone are now so ubiquitous that you can find it in the hands of people who are not so comfortable doing the things you suggested, the sort of things you and I and the majority of people find as natural as blinking.
Case in point: I helped my neighbor purchase and iPhone before she took off for a long trip. I showed here how to do basic things before she left to stay with friends who were supposed to be "iPhone savvy." I sent her texts, and I would get a call in response. It happened many months, so when she got back I asked her if she knew how to text. She sheepishly said she had no clue.
It may sound amazing to many of us here, but the older generation may not be comfortable with new technology the way the new one is.
But don't laugh, because it may happen to you some day. It doesn't matter what the technology is - stone tools, fire, pottery, quantum computing - there are always new things on the horizon.