Andreessen Horowitz's a16z crypto has highlighted a fundamental trade-off in blockchain protocols between low latency and censorship resistance. According to a16z, in standard Byzantine Fault Tolerance (BFT) consensus, when more than one-fifth of validators may act maliciously, at least three rounds of communication are required to commit a block under optimal conditions. In contrast, BFT protocols with strong censorship resistance require at least five rounds of communication. a16z notes that these additional rounds provide stronger user-side guarantees, ensuring that censored transactions do not have to wait for an uncertain number of blocks. Instead, they can be included within five rounds under optimal conditions, enhancing the protocol's reliability against censorship.