Stuff like fans for extra downforce and higher power engines were tried in F1 but ultimately they push the limits of safety too far. Wouldn’t want to be in that car if it popped off the ground or the fan failed.
The limits on safety are moved in both directions all the time.
Example of more safety: the halo device.
Example of less safety: driver controlled active aero in 2026.
It was dogma that it would be unsafe so it has been forbidden in F1 since aero has been a thing in car racing. Then they remove energy recovery from the exhaust (the MGU-H) to lure new manufacturers in. They don't want to add refueling again, they don't want to make a bigger ICE and they are scratching their heads for how to run in about the same lap times with the same amount of gas and a less efficient power unit. So they reduce drag with active aero.
They could have allowed it at least since they let DRS in, or allowed fans. Both are greener ways (as in more energy efficient) to run fast and generate downforce than throwing HPs at it.
Anyway 2026 cars will lap slower than in 2025, especially on fast circuits like Monza because a less efficient engine is still a less efficient engine and simulations show that active aero can't compensate the loss of the MGU-H. F1 has been getting more and more prescriptive with its technical regulations since at least the 90s.
Stuff like fans for extra downforce and higher power engines were tried in F1 but ultimately they push the limits of safety too far. Wouldn’t want to be in that car if it popped off the ground or the fan failed.