0-3= Who is in charge? Then ask them.
4 = Who cares what we do in the U.S.A, the spec. being old doesn't make it wrong and you already had it. Is this oilfield related?
5= Good no wire pulled.
3-My Question was not about following the project specs, my question was about replacing the EMT with RMC ( i.e. why I should replace? ), and when I asked the consultant for the reason he said " it is in the project specs".
There's your answer! They are paying you, that's what they want. Doesn't matter what the NEC says as long as it's better than what it requires. Which RGS is.