The multiple choice and practical exams are not done by the school, but by an accredited / governmental institution. Each have a ~30% failure rate.
Counting 1 lesson unit as 45 minutes it’s definitely not quite as rigorous as a PPL, but certainly in the same spirit, I’d argue.
Being completely honest, I did not feel totally comfortable behind the wheel until maybe a week or of actually driving myself, post-license. (Not that I didn't have a lot more to learn, obviously)
During that week, I could have easily gotten into an accident and did have one or two closer calls.
I would not all be opposed to maybe an additional ~10 hours of more rigorous behind-the-wheel driving, or a very good-quality sim for that same amount of time.
But realistically, I'd imagine making this a hard requirement would hit some massive walls. Good simulators are expensive, everyone wants to drive, and states have very limited budgets for this sort of thing.