I understand all that. The fact is that, at least in the vertical sense, the terrain clearance of 2.5% provided by a SID and most Missed Approach procedures is in excess of the OEI performance required for both takeoff and landing, so regardless of what is written on paper about what is designed for what, if one is able to achieve 2.5% (all-engine or OEI), one can follow the SID or published Missed Approach procedure and be "covered" (lateral tracking rules not-withstanding).
The thread issue, however, is about whether a operator can ignore the basic performance requirements for Approach Climb (2.1%) by following an EOSID (at or below the EOSID weight), during a Missed Approach.