[the_why_of_y]

OpenBSD's CVS contains implementations of bootloading[1], logging[2], device management[3], network[4], etc. For the simple reason that you need all that to have a useful operating system.

[1] http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/stand/boot/

[2] http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/syslog...

[3] http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sbin/atactl/

[4] http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sbin/ifconfig/