If handbrake scares them, don’t you dare to demonstrate how to use ffmpeg. I remember when I used handbrake for the first time and thought “wow, it’s much more convenient than struggling with ffmpeg”.
Handbrake's UI is in the uncanny valley for me -- too complicated for use by laymen, and way too limiting for use by people who know what they're doing...
Was he able to use it correctly though to be able to digitize video with exacltly the correct setttings so that no notable loss of quality was introduced? How long did it take him to randomly test settings?