Implementing proper monitoring in a toy system doesn't prepare you to do it in a massive critical system, but at least you may had learn something in the process, and notice things that in big scale may not be as evident.
In any case, fun starts when the system have more interdependent components.
I think there is value in learning which pattern is good to apply in which scenario, and I will argue that in this case the best pattern is “servers are cattle”.
One of the stretch goals for me writing this article was indeed to show between the lines how Prometheus Exporters, the OpenTelemetry Collector and Systemd can all work together. That is a very reusable skill on monitoring workflows running outside containers on Linux VMs or hosts.
In any case, fun starts when the system have more interdependent components.