It's amazing how much knowledge is being lost with the advent of container revolutions and orchestrator Os'es. Cgroups is _still_ opt in not opt out...though those who never have worked in HPC on bare metal with parallel libraries and approaches for cpu like openmp are loudly complaining about control groups that don't control or provide consistent view of userland like there isn't a host system underneath. It's like this (https://www.gnu.org/software/libc/manual/html_node/CPU-Affin...) wasn't the way things were done (and still are to this day) in everything but the container world. I know it's hard to grasp but not everyone is containerizing everything.