Noisy neighbors tracking can be automated and partially solved then. With cloud you gain access to the provisioning API and with Terraform/Ansible stack (as for example) you are able to build up and manage infra quickly, efficiently and declaratively. Bare metal provisioning can also be automated (as via private cloud solution, for example) but you need dedicated team for that (and nice OpenStackers aren't cheap). I was solo managing 500+ hosts once on public cloud, there is no chance you can do this without what you call "hipster tech" and modern devops toolchain.