Folks are acting like the only use case for this is sending commands for deploying software or something. Even in fully automated environments at scale I used

Folks are acting like the only use case for this is sending commands for deploying software or something. Even in fully automated environments at scale I used Cluster SSH extensively in my past life for things like grepping local logs on all members of a cluster at the same time, or querying local status. It's immensely helpful when troubleshooting issues in large environments. Of course you shouldn't be redneck deploying stuff with Cluster SSH when you could write an Ansible Playbook or deploy Chef/Puppet/Salt. But to troubleshoot issues and manage host/OS level functionality on multiple identical systems at the same time, it's invaluable.