This idea is as confused as people who claim that they "don't need package manager because they have Docker". So what if you will have containers / jails? -- Y

This idea is as confused as people who claim that they "don't need package manager because they have Docker". So what if you will have containers / jails? -- You still need to install multiple components into the same container / jail... because you need them to work together. It's not solving the problem at all. Of course, containers are useful, but not for the purpose of solving installation of software comprised of multiple components problem.