That's correct, but there's driving at 30-40, on urban local roads, and then there's getting onto the motorway via a slip road, getting upto speed and safely slotting into traffic going 60-80 mph.
I've only been driving 18months ( late starter) and I did pass plus with my driving instructor after I passed, because I wanted a few hours of quality tuition under my belt before I went alone.
I've driven London to Peak District a few times now, and apart from psycho euro Lorry drivers ( and the odd uk one) switching lanes without indicating or even looking, it's been fine, that's because I don't drive up people's arse, I leave plenty of room between myself and the car in front.
But it can be daunting for some of the younger drivers, less confident, especially down south, with the M25, the North Circular etc. to be dropped into that madness without some experience and instruction, could put some people off driving on motorways for some time