You could say that one big advantage that classic bikes have is that the rider is of a mature age and should have lots of road experience and common sense, This doesn't really work out all the time and through no fault of the rider. Often mature riders get a classic when they return to biking when they retire. Things have changed from when they used to ride, for one traffic is moving much faster. Classic bikes used to be some of the fastest vehicles on the road compared to Ford Anglias and such like. Also with age comes deterioration of the riders abilities, their eyesight, balance and reactions...it happens to us all. Modern bikes can help with these dynamics with better tyres, brakes, handling and stuff you no longer need to worry about, like a starting ritual when it stalls at a roundabout!
You can't beat plodding around the country lanes on a British single en route to a pub for an ale and a pie with chums. It's when you need to dip your toe in fast modern roads that the plot can unravel. Nothing we can do about it except keep our wits about us. But I guess everyone here knows that.