There is nothing to prevent you from using the SD for planning, and then throwing it on the back seat (while running in navigation mode) so you have a trace of what you did right and wrong while doing WW2 style navigation. I would rather have you looking for a few seconds at the magenta line, establish a good heading with proper wind correction, and then spend the rest of the time (say 95+%) looking for traffic.
SD must be seen as an additional layer of protection against airspace bust, CFIT etc, but it should not interfere with your primary duty of traffic avoidance.