Because some of us have never heard of devcontainers as a named concept with its own spec until now. I've been running my dev servers inside containers for a long time now (using JetBrains IDEs!), but have never heard of this before.
> It is well known that a container offers a sandbox and process isolation.
No, actually, it's well known that containers don't do that. It's one of the first things you learn when you start learning about containers—they are not virtual machines and are not suitable for running untrusted code, because they share a kernel with the host.
I just read through the introduction to devcontainers and there are lots of benefits it discusses but security isn't one of them:
