I just wish ICAO/NAA would agree that a change of one millibar (or even two) is of no interest to anyone, with todays modern aircraft, Radalt, etc. It is all so pernickity(?) it makes me laugh.
Getting given a one millibar change during the take off roll, I wonder whether it is better airmanship to abort, because it must be too dangerous to get airborne with a major altimeter error!
No complaint with controllers! Just the rule makers!