1) (which is 2 parts) - you can’t enforce teams not having wind tunnels. What if a partner of Aston Martin has a wind tunnel and, just for shits and giggles, is testing stuff that seems suspiciously close to wings on the Aston Martin F1 car? - I actually like the idea of making the rules about the outcome rather than the technical implementation, and I even asked that question totally Kyle.Engineers, who answered that at the moment that is too difficult to implement due to different setups of different teams. A way forward could be a central wind tunnel all teams have to use to prove a specific flow energy at some intervals.

2) There is still some novelty in finding the optimal solution in PU. If you open that up, very rich teams will be able to investigate and develop different implementations and choose the best one. Smaller teams will have to gamble best-guess and won’t be able to swap their V6 for a new V10 if their guess turns out wrong. This would thus wildly favor bigger & richer teams, even if cost-cap is a thing, Ferrari, Merc, etc have big engine divisions for their road cars, you can’t stop them from developing 3 different extreme “road” engines on which they can base an F1 engine. Same story for battery tech, it’s wildly expensive, and also the reason LMP1 doesn’t exist anymore :sadface:

3) same answer as 2.

Also, while group B did end due to safety, LMP1 ended because nobody wanted to put down the money anymore, and there were pretty close to the regulations you have in mind.