In general, my experience is "the more moving parts == less reliable", if I were to generalize across two decades of running web services. The most reliable platforms I've helped manage has been platforms that tried to avoid adding extra complexity until they really couldn't avoid it, and when I left still deployed applications by copy a built binary to a Linux host, reload the systemd service, switch the port in the proxy and let traffic hit the new service while healtchecking, and when green, switch over and stop the old service.

Deploys usually took minutes (unless something was broken), scaling worked the same as if you were using anything else, increase a number and redeploy, and no Kubernetes, Docker or even containers as far as the eye could see.