Grip does not equate to precision in 3d printing. reliability maybe. for precision we hunt more steps/mm of travel. Double drive gears do nothing for this effort so they can have no impact on precision. And I think what you read about backlash was directed more towards wade extruders with printed gears that must be set up loose so they don't bind rather than the precise mesh of the geared titan extruder that has no backlash that can be felt by a human hand. What you are obviously missing here is that stepper motors spin at a very slow speed in extruders. So low of a speed do these extruder stepper motors have to live at that companies make gear reduction extruders to the tune of 3:1 and 5:1 because even when we are printing at a fast pace these stepper motors spin at a fraction of their max potential while pushing filament.