My take on this is all annotation (text, dimensions, blocks w/attribute data) shall be placed consistantly in the space indicated by the spec, not a mish mash.
We have had clients that wanted MS, others that wanted PS. There are compelling reasons for either (if Matt sees this I challenge him not to join in) which I care not to entertain here.
The bottom line is consistancy, and a spec must address the issue or suffer the whims of CADD Operators who sport widely varying ideas of where annotation should go. You do want all your drawings to be the same.