The current breed of circuits are designed around very tight regulations and already have artificial, purposely-designed overtaking spots. The lack of close racing and overtaking on the recently built 'Tilkedromes' proves that the tracks are not the (main) cause of the problem.
The real issue is lack of mechanical diversity, resulting in designers and engineers to produce more or less the same car. Without performance differentials overtaking is going to be very hard. What better argument for opening-up the regulations is thinkable?
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