"Focus better" -- in the terminology used here that would be; placing the plane of focus in the optimal orientation and distance from the camera to allow for the planned increase in DoF when closing down to the desired aperture. Otherwise, I always focus better with the lens wide open.
Agreed, and some masters have not used that resource of technical information to produce their work, instead using their experience with the GG as their guide rather than abstract formulas and imaginary junctions of planes.