Comment by nine_k

Try e.g. Void Linux, it's built by BSD-inclined people and is also refreshingly simpler than most big distros. (It's my daily driver for the last 8 years.)

But if you want tighter integration of userland and kernel, I suppose what RedHat is doing is closer to that. They pursue a non-Unix way though: an immutable distro, ideally only running systemd and podman in the userland, put everything into containers.