With AEMaaCS the users are managed externally in Adobe IMS. Groups can be either assigned in AEM or IMS but the latter has the advantage that adding a user and granting permissions happen in the same tool. It would be beneficial if new groups are automatically created in IMS by the ACTool. That requires implementation of this API: https://adobe-apiplatform.github.io/umapi-documentation/en/api/usergroupActionCommands.html#createUserGroup
With AEMaaCS the users are managed externally in Adobe IMS. Groups can be either assigned in AEM or IMS but the latter has the advantage that adding a user and granting permissions happen in the same tool. It would be beneficial if new groups are automatically created in IMS by the ACTool. That requires implementation of this API: https://adobe-apiplatform.github.io/umapi-documentation/en/api/usergroupActionCommands.html#createUserGroup