I say it is the rider, not the bike. Road conditions another big factor.
This is pick-up country for cages, and cruisers for bikes. I see very few sport bikes, and they seem to be mostly ridden by 'kids', if you'll excuse the expression.
No way I could keep up with a sport bike rider with my experience, but them I don't see many of them. They're in the Triumph shop when I'm there, but don't see them on 'my' roads.
I ride a lot, and never have a bike following me more than a mile or so, and that's because I'm behind a slow mover. All the bikes I pass are cruisers.
Most of the twisties I ride are blind, and even if the bike can do 100mph, the eyesight doesn't go that far/fast, and it would take a fool to max out, not knowing if there were a deer, tractor, or Amish buggy around the next bend. Even seen a few cows in the road. Being able to lay it down in a slide only gives so much peace of mind.
On paper my Rocket is no match for a sport bike with an experienced rider.
On the asphalt, things even out quite a bit.
Different roads, different story.