Because it's convenient. I use curl often, but admit to using Bruno even more often. And yes, I could have some organized scripts or something, but for playing with various APIs daily, sometimes importing whole .json collections, or even setting up credentials in one place and reusing them across all the requests from a collection - that's just fast, easy and convenient. Same for responses - yes, I could work with jq and analyze in the console, but often I don't really know what exactly I'm looking for, so it's just easier to have it visually parsed and click through items