You are namespaced, so the linux kernel promises that even though you're root, you're not dangerous, and there is syscall filtering and shit going on.... but that historically has not really fared that well!

But your statement is false. You're root with and without privileged. Privileged gives you back CAPABILITIES which are different than USER, so your claim is bullshit.

That is objectively false.

uid = 0 is "privileged" basically everywhere in the kernel, from filesystem management (reading a file bindmounted in that's owned by root e.g.) to binding to low ports (like 80).

As you can see from the docs, it says "the most important security improvement is that, by default, container processes running as the root user will have expected administrative privilege (with some restrictions) inside the container but will effectively be mapped to an unprivileged uid on the host."

This implies the reverse, that if you don't use userns then your process as root in the container will be mapped to a privilege uid on the host.

This is all I'm saying is true. You clearly don't understand what I'm saying.