Why are reports generated when tests fail?

I was submitting a feature request for the [vitest project](https://github.com/vitest-dev/vitest), regarding that generating coverage reports when unit tests fail does not make a lot of sense.

It was noted that tools like c8 do generate reports on failure (https://github.com/vitest-dev/vitest/issues/2908#issuecomment-1442890311) and I was wondering if there was a reason for this.