Nodes end up in unconnected islands of content knowledge. Whatever node you pick to query has a low probability of knowing about some content posted on some oth

Nodes end up in unconnected islands of content knowledge. Whatever node you pick to query has a low probability of knowing about some content posted on some other random node. The workaround is to force the p2p topology to make a reachable subset of nodes that you use for both posting and querying, but that's not too decentralized because someone has to coordinate the topology override scheme.