The document discusses Docker and how the company Lenses.io uses it for various purposes like reproducible builds, sharing environments, deploying tools, packaging software, and testing. It addresses whether strict adherence to best practices and patterns is always necessary with Docker or if exceptions can be made in some cases. Several examples are provided of instances where Lenses.io either follows or breaks certain patterns with justification. The document advocates balancing practices with pragmatism and argues that what creates value for customers should take priority over rigid rules.