Problem with lots of lines drawn on the chart extra to the route (and a few circles round danger spots) is that it clutters it up. The classic chinagraph lines are fat & obscure bits too.
If one is off course, and over ground features where reading them to chart is feasible, just change course a bit to corrrect. It really doesn't matter what angle, but gently is more efficient.
If you're, say, flying 5 degrees off track & persist with this, all other things being equal, you will be 5 miles off to one side in 60 miles. And pro rata.
So unless you're following a badly mistaken course plot, you're never going to be too far off if correlating features regularly crop up.
Now if it's another thing altogether when featureless terrain/water is crossed !