"When you install a Linux system its just a bunch of RPM or DEB packages. For example of you install CentOS 7.8 Minimal variant you end up with several hundred RPM packages installed. After a week or month many of these packages will get updates sometimes making this CentOS system unusable or even unbootable (recent GRUB Boothole problem for example). On the contrary FreeBSD comes with a Base System concept. This means that when you install FreeBSD you install a minimal system as a whole. No packages or subsystems to be separately updated. Just whole Base System. That means that /boot /bin /sbin /usr /etc /lib /libexec /rescue directories are untouchable by any packages. When you decide to install packages (or build them using FreeBSD Ports) they will all fall into the /usr/local prefix. That means /usr/local/etc for configuration. The /usr/local/bin and /usr/local/sbin directories for binaries. The /usr/local/lib and /usr/local/libexec for libraries and so on. The FreeBSD Base System kernel modules are kept in the same dir along with the kernel in the /boot/kernel directory. To make things tidy all kernel modules that are provided by packages go into the /boot/modules dir. Everything has its place and its separated."
All this quickly became lost when #systemD from #Redhat aggressively took over...
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