Soooo you're not actually arguing for cURL but for bash scripts and potentially something else.

And now you come across all the issues that come with that, like portability, the inevitable messiness of Bash (and the fact that people actually need to learn it unlike a GUI tool that uses simple JS for scripting), and you lose all the convenience of a nice UX and stuff like validation that comes with it.

In other words your argument is about as valid as people who argue that vim is the peak of IDEs and noone ever needs anything else. Which - I really hope - you realize is a bit crazy.