Dynamic scaling is not really even available on a single node kubernetes.
I was thinking more of
Running multiple websites. i.e. 1 application per namespace. Tooling i.e. k9s for looking at logs etc. Upgrading applications etc.
Namespacing is great; look at how Notepad++ was hacked. They were sharing a non-namespaced deployment with other applications, IIRC.
Namespaces exist in Linux [0], they weren’t invented by K8s.
You can view application logs with anything that can read a text file, or journalctl if your distro is using that.
There are many methods of performing application upgrades with minimal downtime.
0: https://www.man7.org/linux/man-pages/man7/namespaces.7.html