It’s wild that’s legal there! Where I live learners and provisional riders are restricted by power to weight ratio (150kw per tonne/200hp per 2000lbs), and that honestly seems like it keeps them on reasonable bikes for the skill level without having them all stuck on 125cc bikes struggling to reach the speed limit
Your provisional rider laws are a lot more fair than Europe’s, which limit teenagers to 125cc for the first two year of riding.
150KW/tonne (with the rider) is enough to get a Ninja 400 or Harley Sportster 1200, both of which are plenty powerful for the street. But maybe these calculations don’t factor in a typical rider’s weight.