We have ArcGIS Server 10.3 running on an old server. We are setting up a new sever and will install 10.7.1 (single-machine deployment). My current workflow is to publish a map service from ArcMap, create a web map in AGOL, then use WebApp Builder (developer version) to create a web application that I copy to the server. I am trying to determine if I should use Enterprise Builder and federate, or keep ArcGIS Server stand alone as on the old server.
I do have one application (and may build more) where I used ArcGIS Server Manager to secure the service. I published the service with Feature Access enabled. In ArcGIS Server Manager I created a user name and password and assigned it a role, I made the service private and assigned it the role. I created the web map and application as described above. I provide the person who needs to use it the link, user name, and password, and they are able to make updates. From everything I have read, it appears I would no longer be able to secure the service that way if we federated and user management was taken over by Portal?