That's true, but multiple combos is one of the public appeals of PM. Without policing to make everything competitive, you'll end up with basically a faster version of the current Pro Stock or a slower version of the funny cars. I think most would agree that isn't a good thing due to their monotony. Nitrous has already been mostly phased out and so will any other combo that isn't as competitive until it's a spec class in practice UNLESS steps are actively taken to ensure a competitive balance. This has been an issue for PM for since the beginning and now with more combos in the mix, it's an even bigger headache.Happens in every class, one combo rises to the top. There is no such thing as a level playing field in racing or in life. Some get it some do not.
If you try to make it level someone is penalized for being smarter, you bring the great DOWN to the mediocre.