I've never understood the use case for Postman or any alternative for software developers.

If you are trying out some API for future use in your code, why bother with some tool when the same can be made in the programming language directly or just plain description of headers and payload, and thus also documented, for instance, in some regression tests?

Of course, it is assumed that programmer knows how to program requests in their language of choice.

Another harm, which such tools bring is that programmers do not understand encodings and other subtleties of the protocols, which are silently "abstracted away", and this can also cause defects in the code and long debug sessions to see "why this worked in Postman, but not here".

It is good to rethink the habit, go through why to use Postman-like tools before finding something else.