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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for certain types of tooling UIs should be cheap, disposable and task/worlflow specific.
The idea behind a cheap UI is not constant change, but that you have a shared engine and "app" per activity.
The particular workflow/ui doesn't need to ever change, it's more of a app/brand per activity for non-power users.
This is similar to how some apps historically (very roughly lotus notes springs to mind) are a single app but have an email interface/icon to click, or contacts, or calendar, all one underlying app but different ui entry points.