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OK :)
So chroot has not been used to isolate processes for decades to a confined view of the filesystem (especially in combo with a restricted shell), and for example the networking namespace is not used to limit the impact on a compromise on the firewall, the user namespace is not used to allow privileged processes to run de-facto unprivileged.
Whatever you say
EDIT: Actually, if you are really convinced of what you are saying we can do the following experiment:
scratch
container running under an unprivileged userThen we can compare the kind of impact that using containers to wrap applications has on the security of the system. My guess, even with a full RCE you will not be able to escape the container.
Half-jokes aside, my stance is that isolation (namespacing and cgroups) allows to greatly reduce the attack surface and contain the blast radius of a compromise, which are security benefits. You can easily have a container with no shell, no binaries at all, no writable paths, read-only filesystem etc. You can do at least some of those things even in a regular Linux box of course, but it is much more uncommon, much harder, much less convenient (for example, no writeable /tmp is going to break a lot of stuff), much more error prone, etc.
Your stance i.e.:
is way too absolute, imo.