Even I thought the same when we started working on console. Do we need other console when we have AWS console already? But gave it a shot found it very useful.
1. I don't need postman anymore to send basic requests to API
2. If I want to quickly check if some file exists or not in the S3, just open up the console and you can see it (even download!)
3. Modern UI, I live in a area with low bandwidth. AWS loads the entire page if I click on another menu (say, to go from S3 to Lambda). But the console just way more faster. Single click.
4. Console shows the only resources I'm using in the project
5. Some other things we're planning in future 😉