In #Bitcoin, you generally don’t want want the whole network to track your behavior. So the standard guidance is not to reuse addresses (hashed pubkeys). In the rare circumstance that you DO want someone to be able follow, then your XPUB has everything they need to generate all of your wallet’s addresses.

In #nostr, you DO want people to track (follow) your posts. The current solution is to use a single pubkey. A different, as-yet-undocumented solution would be to use an XPUB-like data structure as your identifier. This would allow you to sign posts with different private keys while your followers had a consistent identifier to track.