Well.. even though I said you and I won't agree on the laws I'll continue for a bit. First: I don't think Texting while driving is a good idea for the vast majority of people. I just don't think it should be a law to such.
For your argument about holding a conversation taking more brainpower than yelling at your child I disagree. Both require similar amount of cognition. Holding a conversation with the neighbor sitting next to me actually takes more of my thought than texting (there's a caveat explained below).. because I am focused on what they are saying, or what I'm yelling to my kids, or looking at my kids in the mirror instead of focused on the road.
So IMHO, the risk of texting while driving increases and decreases with the type of phone you are using - and is heavily dependent on how responsible the person doing it is. However, a swerving vehicle is a swerving vehicle, no matter what the reason is. And this is where the "Reckless Driving" should be employed.