So that your build process is faster. If I can use the same container for local dev, continuous integration, staging, and production, that means I only had to b

So that your build process is faster. If I can use the same container for local dev, continuous integration, staging, and production, that means I only had to build it once and the pipeline to get something from a developer's laptop to a production instance is much quicker. Just because I can install the operating system doesn't mean I want to do this on every deploy of an application.