I flew a Chipmunk out of Booker with a former Nimrod display pilot for a jolly. We laboured up to 5000 feet and before we started looping and rolling, he asked "Do you want to see what happens if you get slow in the circuit ?" I flew a practice base leg profile and slowed to 50 kts before turning for final and the world fell apart. I was looking up at the cows in a split second. He commented .... "Imagine doing that in a PA-28 at 500 feet, they would collect you with a shovel".
IMHO, every student should be allowed to cock it up in a safe environment. It teaches you why the numbers are sooooo important.