Which brand of car are you refering to? Also, you are not taking in to consideration the amount of traction that any given track has. There are a lot of carpet tracks that lack good bite that would benifit from a little chassis flex, t-bar or link. And isn't that why there's a bunch of different tire compounds available? Something to suit different cars and driving styles.

Both styles of cars are/can be competitive in the right hands. Everyone is entitled to an opinion and mine happens to prefer a t-bar.