By the time you assess the situ at "decision Height",prompt selection of "Go-Around"(CAT2/3)will have allowed the a/c to 'sag'below the said DH..This is acceptable to the Reg'authorities provided one is trained to the 'prompt'evaluation.
The became controversial with the advent of 'Managed/Vnav'Approaches,and towards this end(the 'sag' situ)several Companies 'add' to the MDA for abnormals(Like eng/out,heavy and of course your usual temp 'difference ).The additives varied from +50-100'........Thats why the GEAR comes up last with the posative rate o'climb...
