I think if you look into it more you'll see that it's no more centralized than Bitcoin Core. The difference is that there's consensus in current state and trajectory.
As for use cases, it's four years old and developers are just now addressing Kaspa with Python (an example for its youthfullness).
Not core has built out/is building out:
https://k-social.network/ (all interactions are L1s... not L2s)
https://x.com/maxibitcat/status/2008218445431636073
https://x.com/KaspaKii/status/2008293475561701565 (replacing the entire SS7 telecoms)
https://x.com/kaspador_/status/2008266863084548172
The use cases are innumerable. I wouldn't complain about lack of innovation in other areas as the DAG structure to 10 blocks per second hard fork was completed just last year. This isn't another store of value. It's an entire decentralized network. "Failure to innovate" in other areas is a time preference issue. Not a technical one. Anybody in Bitcoin should understand this.