they're supposed to be super strong, so they're harder to blow. I guess this is good for people who like replacing rings or other engine components.
Ideally, your stock replacement head gaskets should not blow if the car is built and tuned properly. The pressure has to go somewhere, so putting a tougher head gasket on a car that isn't set up properly just makes the pressure escape through the next weakest link: rings, seals, etc. You want your head gaskets to be the weakest link because - relative to the other parts that could potentially be damaged if subjected to excessive pressure - they're the cheapest/easiest to replace if need-be.
That's what I've read in the past few years of reading similar threads on here.:SNSign: