I had to do several "modifications" to make my Royal Star rideable. The points were made of cheese and kept closing. The clutch was so heavy that your fingers froze in the middle of summer. The brakes should have been called retarders! I suppose that we didn't go that far in the sixties!
With electronic ignition, a seven plate clutch with ball raced thrust bearing and a twin leading shoe set up, it was much better!
If they can "modernise" them and keep them oiltight, they may be onto something. However, if the "new" Royal Enfields are anything to go by, I doubt it!