I know that there is nothing that an add-in can do that a scripting environment can't and it is not a that difficult, which is the assertion I am responding to. Sooner or later the dialog box driven tool will prevent you from doing what you want.
I would still like an example of a series of Http:// requests that is "difficult" to do with just curl, wget and a bit of shell script.
Curl is my go to tool for this sort of interaction. I have been a long time Postman user though. The number one feature it has which curl doesn't is collections. Which is basically their name for saving queries. I have my companies entire API saved in various collections which allows me to quickly do any API call without looking at documentation or having to whip up so JSON boilerplate.
For more advanced or one off testing, curl would still be my go to.
I would still like an example of a series of Http:// requests that is "difficult" to do with just curl, wget and a bit of shell script.