In general a PCV system serves three purposes. It burns vapors that would otherwise escape into the air. It can reduce crankcase pressure to lessen
oil leaks at seals and enhance engine performance slightly. And it can reduce contaminates inside the crankcase allowing
oil to remain cleaner longer.
The Cobra I once owned was built for street and track use with no PCV and a catch can plumbed to the closed valve covers. I changed the
oil and emptied the small amount in the catch can before each track event. Other than negligible damage that may have been done to the environment, I saw no disadvantage to that system. Had it been a car that saw 15,000 miles per year, my answer may have been different.