True, in places where the only sources of radiation are rare events like GRBs. But I imagine there must be hospitable exoplanets somewhere in the universe that

True, in places where the only sources of radiation are rare events like GRBs. But I imagine there must be hospitable exoplanets somewhere in the universe that are, for one reason or another, subjected to more intense radiation constantly, in which case rad-protection would have a strong impact on evolution