Microburst2002
We must not confuse approach climb gradient requirements with obstacle clearance for the missed approach procedure!
Exactly.
Allow me to elaborate:
Regarding approach and landing climb for certification, these are just ways for the authorities to ensure, that the aircraft being certified, is able to climb somewhat at all. They (FAA originally) deviced these manoeuvres and set the requirements, that needs to be demonstrated, to a level that they decided was to be considered safe.
It has nothing to do with obstacle clearance. They demonstrate that the aircraft has a certain climb performance, nothing more, nothing less!
A complete different authority (ICAO), set a limit for minimum obstacle clearance during (all engines operating/normal/standard/day-to-day) go arounds. Their assessment of what is safe resulted in a minimum required gradient of 2.5%. For our modern high-performance aircrafts with gradients in the 15%+ range, this is not a problem (remember these requirements were set in the 60'ies and applies to propeller/general aviation aircrafts as well).