This is my point. Those tools are great specifically because of the simplicity of how they expose their functionality.
ffmpeg does all things media conversion. If you don’t want to learn how to use it, you find someone that does (or do the LLM gamble) or try to find a wrapper that have a simpler interface and hope the limited feature set encompasses your use cases.
A cli tool can be extremely versatile. GUI is full of accidental complexities, so unless your selling point is intuitiveness, it’s just extra work.