NOSTR hasn't reached critical mass of users yet, that's really it's only issue.
That and client-server decentralization instead of p2p decentralization, which isn't exactly the protocol's fault. I do...
The curve is the protocol's fault though. It's 2026, nothing can be advertised as the anything of the future it's built on elliptic-curve cryptographic and with no possible migration pathway to lattice based or other.
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