Microsoft has announced that they are replacing the user data search tool with Purview eDiscovery standard. The change will happen on 30 August 2023 and active user data search cases will be transferred automatically to eDiscovery standard at that point. The change makes sense because the user data search tool hasn’t been enhanced much since its inception. Anyway, user data search cases were simply a special form of eDiscovery case, and now they’re all the same.
The need to find SharePoint documents with sensitivity labels might arise during a tenant divestiture to decrypt the documents before the split. As it turns out, searches against the SharePoint InformationProtectionLabelId property is a good way to find the files. After that, the need arises to decrypt the documents, which is where Microsoft Purview eDiscovery (premium) might come in handy.