I follow all the points, except the cornering. My car tires are wearing out prematurely on the edges because I corner too fast. I've had to increase the tire pressure to try and even out the wear. I would think cornering on a bike with a car tire would cause you to ride on the edges of the tire, causing it to wear out the edges. The rounded shape of the stock tires would seem to keep more tire in contact with the road. Someone mentioned something about traction on wet roads? I really dislike the squirrelly feel of that fat tire on wet roads and road paint.
What are the down sides, besides that apparently my Triumph dealer would not mount such a tire on my wheel?