Ahha, OK and totally fair enough and I can agree with you on many points.
In some ways much driving / riding is about distraction compromise, swapping one benefit of information, at the cost of lost data gathering from a former source.
I can see now that you think I am agreeing with 'hand held' use, I am not and not sure that I had agreed with that anywhere. I do NOT 'believe' that hand held phone use in a vehicle is good practice at all, and I am surprised that so much if it still goes on. I would like to see more data on this, especially from good UK sources.
I agree too, that hands free devices are cheap. I have asked a few local people to me, and the one's that admit to it, say that they do not believe that they perform well, so don't 'bother'! So, there is clearly a great need for better advertising, promotion & trials to show people how good they have become.
I do not applaud the use of a hand held phone as it requires removal of a hand away from the steering wheel - or handle bars (bikes and motorbikes etc) (horse riding is an exception as horses can be controlled with one hand, legs and body movements.
I hope that puts your mind to rest on that issue.
I agree that there are hands free options, and it is
this that I am referring to, and the ability/ psychology to hold conversations vs distraction/s etc.
We must have proper intelligent research to enable a full understanding of all aspects of all the many and varied communications systems whilst travelling.
The laws then (and only after this research), need to be based on scientific research and data but not from emotional arguments or what we
think might be true, even if that seems like common sense and potentially 'obvious'.
I have been digging up various bits of data :
Driven to Distraction h
hereNew York Times article
hereWiki link Mobile Phone & driving
hereRelative Risk (Wiki) explanation
here and Regression Analysis[url]=http://en.wikipedia.org/wiki/Regression_analysishere[/url]
Driving Psychology - Uni of Hawaii
here(USA but I can find nothing on mobile phone use!)
Distracted Driver Article
hereSome of the above is quite interesting ... still not found the article that I wanted to re-find of distraction though - I have linked to it previously though ...

[Brain Downtime article
here]
Emergency Vehicle gadgets
hereand NY Blogs
here