The speed restriction is due to a max bank angle of 15 degrees on the turn radius.
Precisely. The turn radius will be important either for terrain or things such as PRD avoidance etc. Generally the pilot won't know the background to the story and, especially IMC, one needs to peg the prescribed speed (or speed range) to keep one's nose clean.
Ac such as 737/320, have no problem with a bank angle of 25 to 30 degrees
AEO but not, I suggest, OEI during a miss escape procedure. Were you suggesting, above, that some aircraft have an AEO bank restriction of 15 deg (other than for the usual initial speed transition period or low level turns) ?
FAA/ICAO design criteria do not account for OEI
That's all fine and beaut .. are you suggesting that one (ie corporate masters/pilots) need not worry about an engine failure during the miss .. on such a basis ? If one has a failure, those same design criteria may prove not to be of much value to the situation in which the pilot finds himself/herself ...
very, very few public missed approach procedures will have OEI tracks
Again, fine and beaut. The AOC holder/pilot, though, ought to have a corporate/personal interest in OEI escapes for tiger country runways.
I would not like to be in the box as an expert witness arguing that the smoking hole, post OEI, was OK on the basis that the Regulator's routine prescriptions didn't require a look at OEI problems ... "they were just having a bad hair day, Your Honour"
As always, the rulebook prescribes absolute minimum standards .. not, necessarily, sensible risk management standards for the responsible AOC holder ...