You mention "modern brake pad materials", inferring that they create more heat than the parts are capable of accepting. But, there are many brake pad materials, some equvilent, or the same as, the old compounds. So, that's a solvable issue.

The issue with exceptions becomes, where to draw the line.

Witness this by the ONE exception, left over from who knows when (there were others, but we've stricken them) is being used as justification for this. We get letters regularly like "My car can't make the weight you set with me in it, I need an alternate body part allowance for the Humpback GT", Or, "the hubs fail on the car if we race them too often, please allow upgraded hubs"..and on and on.

I'm in the same boat, my car can not get engine parts. But, I've raced it for 10 years, it's set a lot of records and won some races. It's a tool, and tools wear out. Time to move on. keeps you young!