...and eat into the safety margins built into the approach.

.... which are actually pretty slim, considering (say) an ILS with a DH
of 200 feet, an altimeter that is good to +/- 75 feet, and an approach
that is a few dots off.

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.