Confused Fast:
For the purposes of this discussion it’s the fact that a 6 wheeler rigid can pull the same 45 foot trailer on a dolly with less cut in and the same tail sweep as pulling the thing with a tractor unit would.
As I’ve repeatedly tried,without success,to tell you it’s an ‘artic outfit’ or a drawbar outfit’ and cut in is based on steer axle to trailer axles.
Firstly see your own quote above 
The dolly mimics what a unit would do “guided” or “steered” if you will by back of the prime mover
Exactly what the unit (of an artic outfit) would have to do is to be driven up to the junction on a wider line further from the kerb and then be driven straight on and then turn later than the drawbar prime mover had to.That’s because an artic ‘outfit’ has more cut in to turn the same trailer than a drawbar ‘outfit’ does for all of those reasons given to you.
Proving beyond a shadow of a doubt you clearly have a massive lack of knowledge and experience. 
The problem for the artic comes though when some idiot decides to add even more length to the trailer in an (unsuccessful) attempt to try to compete with the advantages in load capacity which a drawbar outfit can provide.In the real world it’s then possible to reach the situation of so much cut in that the thing will run out of room ahead in which to drive the unit straight on before that arc of the trailer axles can clear the kerb.Or,worse,someone will add the extra length to the ends instead in which case the sweep increases and although the cut in won’t have altered sooner or later there’s a more than aceptable risk,that some unlucky driver,who’s been lumbered with the thing,will wipe someone out coming the other way with the opposite rear corner on a nearside turn or someone going by on the inside with the opposite rear corner on an offside turn probably without even knowing it amongst other possible scenarios…
Nothing to do with what we are talking about so stop filling your “argument” with pointless bluster to try and fortify it 
You sound to me like you’ve never driven an artic or a drawbar outfit.Whereas I’ve driven both over the course of a 20 year career often on an alternating basis of artics sometimes and drawbars others.
I’ve got, and many members on here will confirm, 3 decades of driving around Europe,North Africa, a bit of Russia and commie bloc, the USA and Canada(including pulling doubles remember) and I aint done yet as I said. At the moment I am doing wide and long load work all over Europe. I have run large transport offices (got very bored very quickly). I owned, in fact built up from owner driver, a small European haulage company of 6 units 8 trailers and up to 8 subbies at any one time. Although 99% artic work I worked for a company in the mid 90’s that had a few “proper” wagon and drags which I drove occasionally including 2 trips to Ibiza which involved reversing on and off ferries with them. All proven fact.
Compared to a lot of the folks on here though I’m a comparative newbie. There’s folks on this site, many of whom you’ve tried to correct, that make me look like a wet behind the ears apprentice
That said compared to you I’m a [zb]ing legend
It seems to me that you’re quite good at dishing out the zb but you’re not so keen when someone gives some back.
I meant professionally insulting. The “bitter” remark merely an observation. Trust me you’re nothing but a pleasant pastime in my life, a novel distraction
.In which case as I’ve said the drawbar outfit does the trick of steering it’s trailer 
and once again this thread has been taken down a totally unnecessary road because crazyhead feels he needs to educate the rest of us with his superior knowledge of all things transport. Even though his experience is limited and he hasn’t been on the road for 13yrs he still finds it impossible to give the guy’s who are out there doing it everyday any credit for their here & now real world relevant experience so in my humble opinion carryfast you appear to be suffering from a personality disorder, possibly narcissism with delusions of grandeur