In Oz they have the 2 classes of motorbike licenses. You must ride a lower powered bike for one year before doing the test on a high powered bike. Personally I think it's a good thing as the last thing you want is a novice jumping on a high powered bike with absolutely no experience, especially a high power road bike Vs say a High powered road bike where the difference in handling characteristics can throw even an experienced rider, unfamiliar with the bike and its handling on the dirt.
Having been dumped on my butt when changing from my own bike (1200 cruiser) to a mate's Ninja 600 I am speaking from a gravel rash and expensive, luckily not fatal experience.