That's 100% true. For some people. People who have ffmpeg installed would know doubt find it easier to enter the command for this, but the majority of people don't have it downloaded. More than that, most people don't find CLIs to be the most intuitive interfaces out there so I figured creating a GUI interface would be helpful.

Technically speaking, ffmpeg could accomplish 99% of what I'm building at https://mastershot.app/, but GUI > CLI for most people.