the T67 will spin like a top...
Indeed it will! And anyone who learns to fly in the Firefly should be shown spinning...it's such an important part of the aircraft's character. But for most people who are only going to fly the usual club planes that, if flown correctly, won't get anywhere near the spin it just doesn't seem necessary.
Are you sure that the instructors were not simply saying that they hadn't done spinning in the sim and was reluctant to do something that might break it? As has already been mentioned if they were instructors then they must have done spinning.