Why are you talking about racing around, the track test is to show wet weather performance using a method which provides consistency across the tyres tested, it shows the overall grip of the tyre in cornering / acceleration and braking situations.
So now i have to drive even slower than the conditions would allow because i've fitted sub standard tyres, what about on the motorway in the rain are you going to drive along at 60mph instead of 70 for that 370mile trip?
Also how is driving slower going to account of the out of the blue realworld situations, i.e. someone pulling out infront of you, standing water etc, these things you can't really account for other than having the best things connecting you to the road.