Hi rinagie,
A lighten flywheel coupled with a racing clutch is a nightmare to drive in traffic!!! hehehehehhe. The lack of modulation of the clutch and the lack of inertia of the flywheel results in a jerky and embrassing engine stalling driving during a 'start-stop' traffic situation. Slipping a racing clutch results in more significant damage as compared when it is done to a standard clutch .So inorder to preserve one, driving smoothly is almost out of the question.
However the reduction of transmission loss which also contributes to the reponsiveness of the engine during spirited driving ,makes up for it.