Command and Control
Live control is only necessary if it takes your instances a long time to be ready to run. As a thought experiment, imagine that any configuration change took ten milliseconds to roll out and that each instance could be restarted in another hundred milliseconds. In that world, live control would be more trouble than it was worth. Whenever an instance needed to be modified, it would be simpler to just kill the instance and let the scheduler start a new one.
If your instances run in containers and get their configuration from a configuration service, then that is exactly the world you live in. Containers start very quickly. New configuration would be used immediately.
Sadly, not every service is made of instances that start ...
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