I'd love to see some case studies of this being used in production systems
If you know some details of the services you're going to host on that hardware, the things you can do while saving a lot of resources is considered as black magic by many people who only deploys microservices to K8S systems.
...and you don't need VMs, containers, K8S and anything.
My favorite way of framing this discussion is use the term "village".
A village is a close-knit group of people with aligned interests (economic and otherwise), activities, rituals, beliefs, and ties of friendship.
But I do not want them inline. I want to use the REPL as a _interactive_ REPL, where I can write my code and later copy that to the file. That's actually one of the reasons I still use Emacs: Common Lisp with Sly and Clojurescript with Cider.