Exactly why the basic Zed cars are so much fun, as you can use 100% of the power without too much worry On a track car then sure, more power is usually better, but for a road car once you get to around 200bhp/ton then there's not really anything that's going to hold you up.
No one would buy super cars if this was the case .
And to be fair in bad weather you ( maybe just me ) can't really drive the standard zed at 100% anyway . For me it's having the power to use when the conditions are right , if I wanted an all weather beast I've bought the wrong car ,...rs4 , ttrs etc