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though increased lap times might be bad PR!
This is the issue I generally have with the evolution of F1. Some people want it to be the pinnacle of motorsport racing, some want it to be the pinnacle of motorsport tech. And those two things like you said are generally in opposition.
While the cars and tech are all very interesting, I'd rather have some good racing instead. If I had to choose between watching F1 drivers in F3 cars or F3 drivers in F1 cars, I know which I'd rather watch!
On the flipside I actually find the Moto3/2/GP tiers actually show better racing the higher up you get.
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It's always seemed to me that the development of carbon brakes has reduced the potential of overtaking under braking now that 4-5g deceleration is the norm.
Once again though that's primarily due to aerodynamics. Without downforce, you wouldn't be able to brake that hard. Regardless of what the discs and pads are made of, braking performance is ultimately going to be limited by tyre grip.
But doesn't every new rule on aerodynamics promise better performance when following the car in front and therefore closer racing? But still DRS had to be introduced.
It's always seemed to me that the development of carbon brakes has reduced the potential of overtaking under braking now that 4-5g deceleration is the norm. It's probably too much of a step to ban carbon brakes, but any change to increase braking distances would be good IMHO - though increased lap times might be bad PR!