Hey Mark, pretty sure you're talking about floodsub, which is a naive implementation of pubsub of top of libp2p, not actually 'libp2p'. Libp2p is quite a bit more than a simple p2p pubsub library.

In any case, floodsub is just one option you can use for pubsub on top of libp2p (one with a notably high level of reliability and minimal cross network latency for infrequent messaging). We also have a tree pruning gossiping implementation called gossipsub. Take a look at the spec: https://github.com/libp2p/specs/blob/master/pubsub/gossipsub...