Docker is more useful to people with more services to containerize, and that often means enterprise. To your average start-up with at most a couple of Rails apps, it's not nearly as much of a value-add.
Don't really agree with this. Being able to configure a new instance quickly and easily is useful no matter how large you are. For that matter, so is being able to spin up an isolated environment on a dev box as fast as you can start an editor.
> Being able to configure a new instance quickly and easily is useful no matter how large you are.
The comment you're replying to didn't say it wasn't useful for the "average start-up with at most a couple of Rails apps" - it said it's less useful ("not nearly as much of a value-add") compared to a large enterprise.
When your entire environment runs on half a dozen VMs you have much less to gain by faster/easier provisioning then when you're running tens of thousands.
