I think there's a reason these wrappers keep appearing - different tools for different use cases. Not everyone needs to become an ffmpeg expert, especially if they only need it occasionally.

For example this one is also ffmpeg wrapper, https://lorem.video and built for devs and QAs who just need a quick placeholder video without diving into ffmpeg syntax. It's optimized for that narrow use case to generate test video by typing a URL.

Nothing wrong with learning ffmpeg properly if you use it regularly, but purpose built tools have their place too.