Lines of code is irrelevant. Docker is important because: 1) it made a convenient process to build a “system” image of sorts, upload it, download it, and run

Lines of code is irrelevant. Docker is important because: 1) it made a convenient process to build a “system” image of sorts, upload it, download it, and run it. 2) (the important bit!) Enough people adopted this process for it to become basically a standard Before Docker, it wasnt uncommon to ship some complicated apps in VMs. Packaging those was downright awful with all of the bespoke scripting needed for the various steps of distribution. And then you get a new job? Time to learn a brand new process.