If the speed restriction wasn't predicated on that nasty mountain, why might it be there ?
The speed restriction is due to a max bank angle of 15 degrees on the turn radius. This is used on the public procedures, to provide for ac variants which have bank limitations, or sometimes bank limits per altitude.
Ac such as 737/320, have no problem with a bank angle of 25 to 30 degrees, and in some tailored procedures, this is used extensively to miss obstacles.
Generally, the concerns are minimal for AEO presuming that the procedure has been planned to account for the OEI case.
FAA/ICAO design criteria do not account for OEI, and very, very few public missed approach procedures will have OEI tracks.