Thanks for your answer! I totally understand that you need to start somewhere to get started and that it will evolve from there. Cheers for making the first step!
Your answer to the expected use cases is also pretty much what came to my mind as I was writing the question. A couple of examples I though of were e.g. I develop an app and I'm looking for visual artists to improve the design, or for music producers to make a soundtrack for my game, or for testers to give me real use feedback, all of which are indeed hard to find in the niche tool-focused communities.
I'll try to take the time to write about my projects in the forum, point taken. It's always hard for me to consider my projects as being good enough for sharing, but I think they may benefit from a fresh eye.