My take on it is: For the driver, keep safety requirements: "safety cell", driver+seatBallast minimum weight (G-force maximums?) For the car: - regulate tyre

My take on it is: For the driver, keep safety requirements: "safety cell", driver+seatBallast minimum weight (G-force maximums?) For the car: - regulate tyre contact patch minimum-at-all-times. NB: not number, placement, manufacturer or compound - regulate other safety stuff like brake light(s) and mirrors/mirror-equivalent-screens etc. - physical size and minimum&maximum-at-all-times weight limit IE mass window. - design wise go nuts. Do whatever you want. Then, when they go too fast. Reduce the size or mass or both for the car. Make them do more, with less. Eventually, you'd end up with gokarts doing current F1 speeds with ridiculous tech. But the driver would be largely a passenger as perfect traction electronics take over and AI driving etc. So then you make the passenger a lottery for those who attend the races... obviously minimum physical requirements.