Containers, like virtual machines before them, aren't the future of computing. They're how we manage legacy apps.
The future of computing is not this horrible kludge.
The future of computing is not this horrible kludge.
The problem containers are trying to solve is not isolation of environments (though, that's a tremendously good outcome).
The problem is how do you develop microservices that are self-contained, easily composable and inherently portable. It doesn't matter if you're running on Java 1.1 on AIX 3.0 or Node on Ubuntu 26, if I have a ball of computing providing a service in Dubai, and want to move it to Ireland to take advantage of computing space that just opened up, containers make that trivial (and about a million other scenarios).
But I sort-of agree in that we're just starting to make the transition from whole-os VMs to app containers, with a rare few going further. But cgroup/jails type isolation is lightweight enough that we can easily apply it at a much finer-grained level.