Interesting discussion. There are exceptions to that rule though, as in ATL, where there's no need to worry about being a few feet low when you're still far out.
http://155.178.201.160/d-tpp/1710/00026PRMAAUP.PDF
Have a look at the 3rd briefing point.
(This is page 11-0 or 12-0 on the jepps)