[gschier]

It's just personal preference. If you don't see the need for this type of tool in your workflow, you likely aren't the target user. It's very similar to GUI database clients. Sure, you could use the command line, but a lot of people need something more powerful.

I started with a folder of Curl requests / environment variables, but it quickly fell over when I needed more complex logic, OAuth, better organization, visual response previews, or anything else that came with my non-trivial use case.