When joining a small company supporting the engineers of the HPC of a large car manufacturer, I was surprised to see so many in-house developed scripts around the scheduler (LSF). Only much later, when playing myself on a private miniature cluster with SLURM, I noticed that different versions of the scheduler software were generally incompatible to each other, i.e. one couldn't use one inside the cluster and another on external client machine. Hence the need for glue software to inject jobs into the scheduler from outside and retrieve the results later on (IMHO devaluating the scheduler).

I would have thought, that after some 30 years of high performance distributed computing, the requirements were well known and at least the protocol for command and data exchange could be fixed. Apparently not so.