Is the word 'Classic' the thing that makes this different to the Trials you see where a kid launches a bike 8 feet to the top of a wall from a standing start?
That and age
To me it's a different sport.
Classic, generally means twin shock and pre '65.
On these bikes there's a different riding style and no one's going to leap a '59 Matchless 8 foot up a cliff.
I'm no expert at all in this, just enthusiastic, there's others here who've been involved in the sport for a long time whilst I've always had a real interest it's only now I've got around to getting a bike and having a go. A 'modern' trials bike, although much 'better' would be of no interest to me