> Is it worthwhile setting up logical links from /bin to /usr/bin and
> having all the bin files in one spot? ditto with sbin?

No.

/bin and /sbin hold files/tools which are neccessary to setup/repair
the system and should be available eg. in single-user mode, if only
the root-filesystem is mounted. Thus they reside in the root-partition.

/usr/bin and /usr/sbin hold files which are "nice to have" but are
not mission-critical during system startup. Thus they usually reside
in another partition (or another disk or even remote system) and are
mounted later.

Thus it's not uncommon on system with small local disks (eg. RD32),
to have the root-filesystem (with /dev, /etc, /bin, and /sbin) and
swap-partition on the local disk, and to mount the complete /usr-
subtree from another machine.

The (IMHO) only reason for shared (ie. nfs-mounted) root-filesystems
is a diskless system.

Directories/subtrees which are usually shared between machines are
things like /usr/share and /usr/local (esp. /usr/local/share) and
and home-directories of the users.

Ciao,
        bertram