What you're missing is that it isn't reasonable to expect people to be paying enough attention to "quickly take over."
In Australia until you were off your probationary license (which was a minimum of three years after your learners permit, which was either 1 or 2 years, it's been a while), there were power-to-weight restrictions on the vehicles you were allowed to drive.
Here? Saw a YouTube video of a seventeen year old doing his driver's license test in a 1500hp Bugatti. That'll end well, no doubt.