I'm well aware of this and good that the option exists to bail out with abort instead.

But there are still cases where you would like to fsync your mmaps, print out a warning message or just make sure your #[should_panic] negative tests don't trigger false positives in your tooling (like leak detectors or GPU validators) or abort the whole test run.

It's not perfect by any means but it's better than potentially corrupting your data when a trivial assert fires or making negative tests spew warnings in ci runs.

It's very easy to opt out from, and I don't consider the price of panic handlers and unwinding very expensive for most use cases.