I’m not the OP, but I had wondered the same thing. After already seeing up the other *arr’s I couldn’t work out the point of Prowlarr.
Re your comment about resource constrained, I have just started using Sonarr and Radarr on a Pi4. They seem to work OK. Had installed but not set up Prowlarr yet. Hopefully that wouldn’t slow things down if I used it to sync the other apps.
For general browsing, news, technology, mainstream topics etc… it’s much better than reddit, less toxic, better vibe.
It’s very small though, so I’ve found two areas where it is just not a replacement:
Specific, smaller niche interests, they might have a community here but it is often empty and quiet or just non existent.
Sports, specifically a place to chat during live events. There’s not enough people to support that.
So it depends what you are looking for and how niche your interests are.
I’ve mostly stopped using reddit and am in here now. But I still end up there occasionally. Not much these days though.