For small scales and small teams that know what each other are doing, what the author mentions is fine. But can you seriously imagine onboarding a new engineer

For small scales and small teams that know what each other are doing, what the author mentions is fine. But can you seriously imagine onboarding a new engineer and telling them to deploy to prod, they need to run an `scp` command onto a host? Docker solves a lot of problems, among them include packaging and deploying a universal 'deployment unit' that works across many systems. The author only requires one uncontrolled unknown to be introduced to break their entire unicorn setup.