Woah, no. Sure escaping via a kernel bug or some issue in the container runtime is unexpected, but I “escape” containers all the time in my job because of configuration issues, poorly considered bind mounts, or the “contained” service itself ends up being designed to manage some things outside of the container.
Might be valid to not consider it with the services you run, but that reasoning is very wrong.
I don’t want to tell you one way or the other because it’s kinda dubious anyway, but if all services run as the same user the need for root is kinda moot when it comes to crossing between services or expanding the scope of an attack. Of course it is better than all things running as root, but if I popped a machine as some “low privilege” user that still had access to all running services I’m not sure I’d care so much about escalating to root.