I think what they are getting at is that they are concerned about your safety and inexperience. I have seen many shows that show how
young drivers have wrecks because they don't realize that things can happen quickly (ie picking up a dropped CD on the floor and taking your eyes off of the road).
One of the most common is running a stop sign or red light because they are talking with their friends. That is just pure lack of experience.
I even know of older adult drivers who have no business driving 500 HP cars because they do not know how to control and recover if they do lose control.
They have courses for that sort of thing and I recommend them to people who have never driven the bigger engines.
But no way am I going at a speed that makes me uncomfortable.
I think most of our discussion has to do with acceleration and not top speed unless we are at the drag strip. I do not think anybody is planning to do
174 MPH on the highways.