"In Nostr you simply "embrace the chaos" of only grabbing the information from hubs you use, and hubs don't try to fetch all information.) For instance, if Ben replies to Alyssa's message in one of these systems but does not leave the reply message in the relay which Alyssa pulls from, Alyssa would never see Ben's reply. If multiple relays were to exist in Bluesky, this same problem would presumably occur, so how does Bluesky solve this?

The answer is: Bluesky solves this problem via centralization."

Based.