Interesting that you assumed it's just using different ports, and then judged the author based on your assumption.

There are other ways to achieve process isolation in a Unix environment without relying on Docker or virtualization.

Thanks for giving me the chance to hide under the marketing rock :) But you're right and I will have a good think about what I'm implying by describing it as isolated. "Isolated" means things to me in this context, but it legitimately implies other stuff as raised in this thread, which Indigo does not attempt to do. I don't want to mislead anyone, marketing jargon or not.