Looking at a GPS recording of my attempts to follow a VOR Radial, or magenta GPS line, they all turn out to be very wobbly lines.
On the other hand when flying with a GPS coupled auto-pilot the track is so much more of a straight line.
So maybe PPL navigation should be more concerned with how to program the auto-pilot for successful wobble free navigation. Also as NDB and VORs may soon to become obsolete, a new thinking on PPL training is required.