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Docker represents a core dependency on someone else's business decisions, technical choices, service uptime and extremely slow build tools.

For some set of reasonable values, these trade-offs are not always worth the benefits.

As one example, we run bare Linux across a collection of 4x on-prem machines for an extremely small business and it works great for us.

To me, containers are as core as version control.

Choose the flavour you prefer, but I do not believe there is a valid reason to avoid either for anything that you need to work on for more than a week.

Docker can be overkill.

I host many rails apps on a single server, having one or two ruby/rails versions installed and a single postgres. They are all sharing the same architecture essentially.

I was thinking the same :). Docker definitely simplifies my workflow.