[ianburrell]

The huge advantage of containers is that can use the same mechanism to run anything. Don't care if it is a single Go binary, dynamically linked binary, or Ruby interpreter and thousand files.

You might start off writing Go programs, but then need to run Postgres database for development. Or discover that need special library in some other language and easier to make its own service. Or need to run third-party service. With Docker, you run the image and don't care what's inside, and the isolation gives some assurance that won't escape.