This.
People need to find their own balance between what they can and can't drive and look at the track at hand. Some people can drive a fast car that doesn't handle that great, some people need a slower car that takes aim at cornering. The thing is though, when you strive one over the other, you usually end up paying (unless it's Daytona) in the end. Personally, I prefer my cars to be faster than have incredible cornering ability. This is just me, and I know there are weaknesses with this style, my cornering is severly limited, but this is my preference. I do tune for some cornering ability, you'd be a fool to think that you should spend all your PP on one or the other, but I spend less PP on cornering than I do with horsepower. Now if you put every bit of points you had in cornering, but the car can't do more than 130MPH, you're pretty screwed, right? Likewise if I take 100 extra points leftover and throw them all in power, I've got a car that hits 210MPH in the first corner, too bad it won't make that corner though.
This is the balance you need. If the car is too slow, it doesn't matter how good you can corner, but if the car can't turn, it doesn't matter how fast it drives.
Case in point is shown perfectly with the new 750PP races. Everyone had their set up that worked for them in the 700PP class, but you can see people in the 750 series having increasingly more trouble with their cars now. Why? Because I can assure you half the people decided to channel that extra 50PP in one or the other, speed or cornering, and not evenly distibuting it. What did I do with my Corvette? I jumped up the horsepower while at the same time upgrading to R2 tires and lightening the car. I was astonished at how well I performed in the first few days against other cars that, under 700PP rules, would have probably been a lost cause for me.
Balance is key. When you prioritize too much you're only asking for trouble.
