Restricting all new drivers is punishing them all because a small number are irresponsible. You could create a lot of havoc and damage with your Panda, it'll do at least 80mph, and it'll hurt if you hit anything at those speeds.
When I passed my test I was already working in a garage, weekends and college holidays. Day after test pass, I had to take a Chrysler across to another garage for an MOT, all 6-7 litres of it. 1970s American thing, bonnet the size of a small country, no way to reach the passenger door from the driver's seat, etc. You've seen them in old films I guess. Access to the other workshop was up an alley, barely wider than the car, but that's another issue.
Following week we went on holiday, and I drove the whole lot, in our old converted ambulance motorhome.
To restrict new drivers would have prevented all of this.
Two years later I was driving everything from a Fiat 126, all 650cc and less than 30hp, to Jag 5.3 V12. And 7.5 tonne trucks.
It's all about attitude. Instructors do what we can to control that, but we can't be there once they've passed. I've had a few 'brisk' lads. I will get them out on a clear road and get them to go faster. Then change seats and do a demo drive, with commentary, like you see the police do, then ask them to do the commentary on their next drive. So much they've not seen, or not dealt with. Opens their eyes to how much could go wrong, even on a quiet road. You want to go fast, show me you can do it safely.
(I really don't want to share the road with any more slow drivers, we have enough already.)