I mean, we have, what, 15+ years of StackOverflow posts to tell us what the common use cases are, e.g. "how do I make a GIF from this short screen cap?"; surely FFmpeg could offer prompt-based wizards for that kind of low hanging fruit.
Why should it, though? It's like saying that CPUs should offer high-level OOP primitives. It's just the wrong layer of abstraction. Let FFmpeg focus on offering the features, and let others build on that to abstract it all away into easy-to-user workflows.