Does Parallel server enable more behavior on a cluster node than just installing matlab on that node and running with parallel compute toolbox?

I'm trying to understand what the parallel server is providing for single node jobs. I would think you can run parallel jobs on a personal computer without parallel server so why no on the cluster node. Would it not be more efficient to just install matlab on a node and run it from there (as an option for a user that does not have a powerful machine to just be able to run their jobs on that node)?

This would be for Matlab, Simulink, and /or Simscape.

Let me know if I am missunderstanding anything.

Thanks,

Daniel