Yes, you're right.
For small clusters and if you don't really need the added complexity of k8s and are willing to do the monitoring/provisioning of nodes, a simple Erlang cluster of your Elixir application is a perfectly valid solution. I think for some internal application in a company that has on premises servers, that's is a solution that works very well.
k8s is not a solution for everyone, and certainly not for small apps, or apps with very few users or that don't need high availability.
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Yes, you're right.
For small clusters and if you don't really need the added complexity of k8s and are willing to do the monitoring/provisioning of nodes, a simple Erlang cluster of your Elixir application is a perfectly valid solution. I think for some internal application in a company that has on premises servers, that's is a solution that works very well.
k8s is not a solution for everyone, and certainly not for small apps, or apps with very few users or that don't need high availability.