Admittedly, I'm an "old guy" so maybe I'm way out of touch with the times, but I'm fairly tech-savvy, well-educated, so FWIW...
I've had 4 very unsettling experiences of near head-on collisions. Each time I saw the other driver look up and get a very astonished look on their face after which they (thankfully) swerved back into their lane.
Meanwhile I was slowing down while maneuvering for safety on the shoulder or sidewalk.
I can only hope that the person who claims texting while driving is NOT a distraction has the same experience, at some point.
As far as talking on a phone is concerned, I have my doubts about that, too.
Again, this is from my personal experience, so YMMV.
I deal with a wide variety of subjects. Some of them are design-oriented. While discussing a subject re the design of something, I find myself visualizing that which I'm attempting to describe. Those are the times I've found myself vulnerable to inattentive driving. For example, I've had some close calls rear-ending other vehicles or missed my turn-off. I DO make a point of getting over to the slow lane and dropping my speed, but I've been surprised by a semi or two that had changed into my lane further up the road in front of me. I missed it because I was... distracted. So I've been guilty, too. (Apparently, something is not happening between my visual cortex and other cognitive functions. Although, my friends from the 60's would probably say... well, never mind. That's for another post.)
Now I hand my phone to my wife and ask her to take the call or exit or pull way off on the shoulder (which isn't all that safe either now-a-days). And when I get a call from someone whose name/cell number I recognize, I ask if they're driving first. I don't want to be the person on the other end of a phone call that contributed to an accident. Besides, I still think most of our phone calls can wait.
Come to think of it, I've even had people walk into me or nearly walk into me in stores while talking/texting on their phones.
Anyhow, please be careful, folks.
Oh yeah... and get off my lawn, kid.