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”.
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Someone who only wants to convert from one format to another, and isn't accustomed to CLIs, is far better served by "drag the file here -> type an output filename and extension in the text box".
The problem (and the reason both FFMpeg and Handbrake exist) is that tons of people "only" want to do two or three specific tasks, all in the same general wheelhouse, but with terrible overlap.
Handbrake is easier in that I don't have to think too hard about how to use it; but that I think a lot more critically about the options that I choose.
FFmpeg is easier when I go in knowing the exact options I want; often pulled from notes that I've stored away, or combined with scripts.