It was later co-opted for the low speed regime once they started flight testing. The speed is irrelevant, it is the AOA that matters.
Seems to me that speed does matter- and was the reason for a fourfold increase in stab trim ( approx .6 deg to 2.4 deg ) in 9.5 seconds due to handling the low speed ( near takeoff regime ). Thus the combination of more movement (AND) meant that at low altitude ( flaps up ) the use of Manual trim was not appropriate UNLESS someone realized that they must use electric trim to get near neutral trim or nose up and THEN cut all electrics.
Or can anyone find- report who ' survived ' on a 'max' simulator which dupicates trim forces on trim wheel at any speed, and the number of turns needed after say ONE degree of Nose down and 200 or so kts and altitude of less than 5000 AGL and done by ONE pilot- even knowing what to expect by" jamming " the AOA in a significant nose up AOA ?
Place your bets .