Passage:

In a commentary on scientific publishing, an editor argues that preregistering studies reduces selective reporting. The editor concedes, however, that preregistration can also discourage exploratory work by making researchers reluctant to pursue unexpected patterns that emerge mid-study. The editor then adds that journals rarely reward careful null results, preregistered or not, and concludes that preregistration is “a useful constraint, but not a cure.”

Which conclusion is best supported by the passage?