The main source material I've used as a guide for cotter pin related matters is Barnetts, which sticks hard to its recommendation to fully degrease cotter pin taper surfaces and their spindle mating surface, and press them in dry. They recommend to grease the nut threads as one normally would with most fasteners on a bike.
When one has to rework the flat on a pin freehand, as is often the case, some amount of imprecision is introduced. Intuitively it would seem like adding lubrication would help with maximizing contact area between the surfaces despite it; i.e. it would decrease the force needed to smoosh it all into place and allow it to get into final, fully smooshed condition with less of a break-in period, which is what you want.
Is Barnetts' recommendation reflective of how most shops actually approached this during the age where cottered cranks were more prevalent, or in parts of the world where they're still encountered regularly?
What are the pros and cons of doing it either way in actual practice?