Too much aero and downforce makes impossible for the following car to overtake
This is commonly reported by journalists and drivers but this is something that hasn't changed much for the last 40 years or so.
The car behind always loses downforce and, funnily enough, because the loss of momentum in the wake is due to the horsepower the aero loss behind the car has doubled since the early 80s simply because of engine power. Fact but never discussed.
Peter Wright did an analysis decades ago which showed the 2 reasons overtaking was difficult was the aero effect, because of the loss of the car behind and high grip tyres because the braking distance is so short (braking distance is only effected by grip not brake material).
drivers like driving with sticky tyres so we never had success controlling that part.
It is even worse in races. By half race distance the racing line is so rubbered in and so much tyre detritus off-line overtaking gets even more difficult.
Drivers say more grip makes overtaking easier, but both theory and practice do not confirm this.
If more grip was better, by implication, the very worst races would be in the wet where grip is less and they are always the best in fact.
The physics is clear but the politics is strong.