That's bullshit. To start a docker container, you don't need to mount a layered filesystem image - nevermind figure out a way how to create and reuse it, you don't need to know all nitty-gritty details of creating network interfaces, private networking, port forwarding with NAT, cgroups, and a ton of other details that are simply not important to get an application running. Docker does that for you.
If you would have to get read all man pages for every single tool you'd have to get familiar with just to figure out how a custom "not invented here" system works - you'd be in for a treat...
If you would have to get read all man pages for every single tool you'd have to get familiar with just to figure out how a custom "not invented here" system works - you'd be in for a treat...