And that is the attitude embraced by jails (to be clear: rather more cleanly and attractively than the expression of the same ideas in linux), and precisely why it lost.

No one wants "containers". They want docker. They want to be handed something that looks no more threatening than a mid-80's build script and have it magically be it's own little world with all its own software and versions and stuff, but still talk to the rest of the world on the same networks from the same piece of hardware (yes, via some weird voodoo to glue all that together).

It's like arguing that no one needs word processing because nroff or LaTeX is all you need. It's not wrong. It's just a failure in the market.