> It's really not, things can be powerful and easy to use. I'd even say some parts of ffmpeg are well designed in this way like `ffmpeg -i ./video.mp4 ./video.wav` working is well designed.

I'd argue that even this command line isn't well-designed at all; it should be `ffmpeg video.mp4 -o video.wav`. How is it sane that anything without an -i in front is an _output_ filename?