I think it helps to inform the developer about possible issues, but I think in most cases depending on the software this is plainly not relevant and can be ignored. I wouldn't classify it has high severity. Also, It might just not be trivial to develop a regex library that cannot be DDOSed or the mechanism that was declared a vulnerability.

Might be nice to be able to tag libraries that should be ignored in audits. Perhaps there is such a function, not really a NPM expert. But if your projects has too many of these "high severity" problems, you probably stop doing them.

Still, I think the availability of such audits from the package manager is quite neat. As an embedded dev I think these are certainly luxury problems.