Should we use start-all script to start the Policy Server if we are not using Session Assurance ?
Policy Server 12.52SP1 and above on Linux/Unix
From the documentation :
You can either start all services or only the ps service.
If you are not using Session Assurance, there's no need to start the Session Assurance service, and as such, use start-ps and stop-ps scripts to have only the Policy Server starting and stopping.