theficklefinger:
Galaxy do you fly planes with a flight manual?
That question doesn't add much to the discussion.
What g.f. is pretty much trying to tell you is that the gradient expressed on either a departure procedure or IAP missed approach procedure is climb performance "apples" and that an OEI profile, whether on a departure or missed approach procedure is climb performance "oranges."
The two appear to some to be related but they are distant cousins, especially when the obstacle environment is critical (aka, "obstacle rich environment" in performance engineering and procedure design parlance).
The obstacle assessment done by the public procedures designers is often of little, or no, use for OEI purposes. It comes down to the specifics of the aircraft you are flying, and the OEI profile your company elects to use. That, in turn, requires a very specific obstacle assessment that is valid for your company's elected profile for each specific type of aircraft.