That's just GUIs being easier to use than CLIs for most people. After all, that's why Postman got popular - it's a GUI to do curl without the CLI! Or Handbrake to avoid using ffmpeg. Or various "paint" applications to rotate images instead of using imagemagik.

The problem is that Postman decided to want to be a business and took VC money.

10 years ago I totally get that but these days there's plugins built into every IDE that can smooth over the annoyances of testing an API via curl without having to invoke paying for Postman and dealing with all of its nonsense.

Of course now that I said that today I'd probably just have Claude hit the API for me, or build a dashboard to test it, I really don't know how Postman continues to exist.