[alojoo]

Yes,
but I think Lynn says that hinge action begins from impact and ends at followthrough. These pictures show that the way clubface comes into impact is different, too.

Coming to impact, the flat left wrist is put in a vertical condition by a partial kind of swivel (or just a not plane related roll), then hinge action starts (controlling the left wrist staying vertical to the hinge action associated plane) from the point where the vertical condition to the intended line of flight is reached.

I think less power leakeage can be found by :
at impact when the hinge action (clubface starts and mantains to be vertical all the time to its associated plane) if that hinge action and vertical condition to its associated plane is present in the swing a millisecond (or a considerable but not great ammount of time) before first contact with the ball. So from first instant the ball is in contact with the clubface to the end of contact when the ball leaves the clubface, hinge action is constant and during the whole time of that period, vertical to its associated plane. So if it is always vertical to the associated plane, less chance the contact point clubface-ball will be changed/lost. I think that is tru with angled hinging and maybe with vertical hinging. But with horizontal hinge action... the same clubface geometry during impact will give us with any hinge action a repeatable/similar ball flight trajectory. But if during contact the hinge action is started, perfect clubface precision is not mantained during the whole "moment of truth", or to the ball.

A horizontal hinge action may have more applied force but no ball flight precision (draw), because at impact the motion of the clubface has not stopped, and continues to apply forward(in direction to the target) motion to the compressed ball, although the clubface remaining vertical to the ground, the left hand/clubface rotation with maximized accumulator nº3 at impact time transmits more energy to the ball because the definition of horizontal hinging allows further rotation of the left flying wedge beyond the moment when reaching vertical position to the flight line and continues to rotate and move the clubhead forward to the target with that further roll in relation to the assembly that is accelerating or resisting to deccelerate. Not so much force obtained from a roll of an erratic-direction swivel action at impact, but horizontal hinging has more roll power at impact than vertical or angled hinge action.

The feel of a reverse roll.
The feel of no roll.
The feel of roll.