For me the ability to squeeze in some jobs in between the cracks at best effort priority is crucial (ie. any sort of high latency batch processing / experiments

For me the ability to squeeze in some jobs in between the cracks at best effort priority is crucial (ie. any sort of high latency batch processing / experiments). I wouldn't want these extremely low priority jobs to compete with, I don't know, an actual customer facing service. Also, we run on bare metal, so there really isn't a way to request extra capacity within seconds.