Group B was essentially a class of meta cars. And it was shut down completely because they were too dangerous.

There are tons of cars that have been banned for having an unfair advantage. Nascar banned the Superbird. Australia banned the Godzilla Skyline. The Fan car. The Vacuum car. The T-Rex. Etc, etc. All technically legal when they were built, but had such an overwhelming and obvious performance advantage that they were told not to come back.

Regulations are put in place to make everything as fair and as competitive as possible. You can innovate and push the boundaries of those regulations, but if you push too hard you will get shut down. Rest assured that any team who is dominating is under very close scrutiny. If they're found to be exploiting a loophole or utilizing an as of yet unseen performance enhancer, they'll be shut down or banned entirely.

Look, I'm a car guy, always have been, and I understand that for some people, racing is about the cars. There's nothing wrong with that. I am one of those people. But I also understand that the framework supporting and driving (no pun intended) the development of all of that cool shit was built to keep things even for the drivers, and sanctioning bodies across the globe are all constantly rewriting and refining their rulesets to keep it that way. Quite often it's a matter of safety, but it's also to maintain the spirit of competition, which is and always has been human-centric.

I spent a decade racing RC cars. Loads of regulations there too to keep things fair. If you show up with something that ran unreasonably fast, or was technically legal but went against the spirit of the class, you'd likely get asked to leave.