I have mostly used Kubernetes for Node.js apps and find it very useful for the following reasons:

- Automatic scaling of pods and cluster VMs to meet demand.

- Flexible automated process monitoring via liveness/readiness probes.

- Simple log streaming across horizontally scaled pods running the same app/serving the same function using stern.

- Easy and low cost metrics aggregation with Prometheus and Grafana.

- Injecting secrets into services.

I'd imagine there are other things can offer the same, but I find it convenient to have them all in the same place.