Explanation
To prevent orders from being deleted in the future, a Salesforce Architect should recommend removing Order delete permission from profiles and permission sets, and changing the record type/page layout assignment for orders to be read only. Removing Order delete permission will prevent users from deleting any order records, regardless of their ownership or sharing. Changing the record type/page layout assignment will prevent users from editing any order fields, regardless of their field-level security. Implementing a sharing rule that changes access for order to read will not work, as it will only affect the record-level access, not the field-level access or the delete permission. Removing the Delete button from the order page layout will not work, as it will only affect the user interface, not the API or other ways of deleting records.