Depends on the actual workflow and on the actual users. As a former manager of large HPC systems, I’d never ever burden myself with the Big K, as Slurm did a fine job for my workload and users.
Slurm does the job well.
My users liked the Kubernetes API to throw their workloads against the clusters, but they did not need/use many on the Kubeflow features.
But again, depends on your workflow needs.