perspective--
i think the best way to view your published manuever speed question is more along the lines of a speed to use when turbulence is expected. (and that speed increases a bit as the weight of the aircraft increases). then perhaps a confidence factor. knowing that there is a large factor of strength built into the aircraft "which one will not knowingly test" but might be grateful for in an unintentional event.
many used to say something similar about transport category aircraft (full exercise of the flight controls) until the American airbus crash outside of new york. then it was brought to the surface that the strength applied only to a single movement of the control--not an out and return just as rapid.
only in aerobatics in a proper aerobatic aircraft should one even consider a full strength effort on any control.
and any "effort" you put into the controls of your aircraft, stores up a fatique factor in the metal involved in the flight control or the control cables.