If you are not planning to use a storage policy, you can delete it.
You cannot delete the VVols No Requirement Policy and vSAN Default Policy.
Prerequisites
- If the policy you want to delete is used as the default, disassociate it from the datastore. See Change the Default Storage Policy for a Datastore.
- If the policy is used by a virtual machine, change the VM policy assignment. See Change Storage Policy Assignment for Virtual Machine Files and Disks.