This is the key, Nostr is for building social networks, and Nostr works.
If you don't like Nostr, you build an alternative, it's that easy, or not so easy.
Discussion
I found similar criticisms when bitcoin was created, they criticized that it was not scalable, that was already known from the first moment, but hey, it worked, let them say it 13 years later.
I am the first defender of p2p, but we have more than 20 years with p2p networks, Kadmelia is the example, has served as the basis for many other networks including ipfs, but we continue to use centralized services ...
I think the key is to keep it simple and keep it simple and have the clients use some p2p for certain tasks like file sharing.
I don’t really understand why everybody thinks changing keys is a complicated thing. It’s virtually the same protocol, same syntax, same apis. The only difference is post signing ID linkage. And nostr could do both extremely well without increasing complexity at all.