I think what the Manifesto was targeting was "blindly" following a plan. In those days, reqs were drawn up, a design spec'd, a plan written out and there tended

I think what the Manifesto was targeting was "blindly" following a plan. In those days, reqs were drawn up, a design spec'd, a plan written out and there tended to be considerable resistance to changing the plan. That's what they were aiming at.