Small and bootable
I've read that it is a good idea for the 'root' partition to be small
and bootable, i.e., for it to only include /bin, /dev, /etc, /lib,
/mnt, /root and /sbin. Presumably, as these directories contain
predominantly static files, there is very little chance of a 'root'
partition organised this way ever becoming corrupted and therefore it
is far less likely that you are ever unable to boot into your system,
despite what happens elsewhere.
Regardless of how many partitions accommodate the rest of the
filesystem, (/usr, /tmp, /var e.t.c.), is this a fair assertion?