You can get resilience from hardware failure and shorter downtime windows if a host needs to be rebooted since the database will immediately start up on another

You can get resilience from hardware failure and shorter downtime windows if a host needs to be rebooted since the database will immediately start up on another node. A good Kubernetes cluster will also give you centralized logging/monitoring/alerting as well. So if you already have a cluster (and an administrator), you do get benefits. But the benefits are only really worth it if you can amortize the cost of the cluster administration over many applications.