True, I had not considered the security aspect. Security is usually considered a non-issue in HPC circles.
It's not a non-issue, it's just a different security model. You need to audit all of the code going into the data center, but once it's there it's (ideally) a hermetically sealed safe space.
It is however designed for secure networks where you have total control over the physical layer-2. If that gets compromised you can be in a world of hurt.
In a past life i configured and set up slurm in vpcs in amazon, was kind of a fun exercise.