The Rhinogs Race this year was a great example of run slowly but navigate well. My missus won the womens and was something like top 5 or so and said she finished not that tired as she'd been so steady but continually navigated and didn't get lost at all until a mistake coming off Moelfre.
Yeah true re a heart attack, but it gives you a better chance of help within minutes. It also means you can speak with the MRT's and talk things through with them, what they feel the best options are, walking off yourself, them meeting you or staying put.
I agree many runners couldn't use a map, but many need to understand the need practice. Going on a course gives you a grounding in the skills but you then need to go out and practice contour recognition and gaining further experience.