Pkarr is about using the right tool for the right job.  It's more like the UNIX approach of dong one thing well.  When things are combined you get a system greater than the sum of its parts.  Nostr should also take the approach of doing one thing well, relaying notes from one user to another.  Some nostr devs are trying to do things with nostr, which impressively work, but dont scale, because they are 20 years behind the state of the art. Use the right tool for the right job and users get the best of all worlds, the apps hide the UX from them, and they just get amazing features.